enable AppImage and rpm distrobutions (#6127)

.github/workflows/multiOSReleases.yml

@@ -408,6 +408,26 @@ jobs:
           echo "Generated tauri.windows.conf.json (alias masked):"
           sed "s/${KEYPAIR_ALIAS}/***/g" ./frontend/src-tauri/tauri.windows.conf.json
 
+      - name: Import release GPG signing key (Linux)
+        if: matrix.platform == 'ubuntu-22.04'
+        env:
+          RELEASE_GPG_PRIVATE_KEY: ${{ secrets.RELEASE_GPG_PRIVATE_KEY }}
+        run: |
+          echo "$RELEASE_GPG_PRIVATE_KEY" | gpg --batch --import
+          gpg --list-secret-keys --keyid-format=long
+
+      - name: Make libjvm discoverable for linuxdeploy (Linux AppImage)
+        if: matrix.platform == 'ubuntu-22.04'
+        run: |
+          JAVA_LIBJVM="$JAVA_HOME/lib/server/libjvm.so"
+          if [ -f "$JAVA_LIBJVM" ]; then
+            sudo ln -sf "$JAVA_LIBJVM" /usr/lib/libjvm.so
+            echo "Linked libjvm from $JAVA_LIBJVM -> /usr/lib/libjvm.so"
+          else
+            echo "libjvm not found at $JAVA_LIBJVM"
+            exit 1
+          fi
+
       - name: Build Tauri app
         uses: tauri-apps/tauri-action@51a9f1156b33df106d827c3a78f8f894946c5faa # v0.5.25
         env:
@@ -418,7 +438,14 @@ jobs:
           APPLE_ID: ${{ secrets.APPLE_ID }}
           APPLE_PASSWORD: ${{ secrets.APPLE_ID_PASSWORD }}
           APPLE_TEAM_ID: ${{ secrets.APPLE_TEAM_ID }}
-          APPIMAGETOOL_SIGN_PASSPHRASE: ${{ secrets.APPIMAGETOOL_SIGN_PASSPHRASE }}
+          # AppImage signing — three env vars work together:
+          #   SIGN=1                        tells linuxdeploy-plugin-appimage to forward --sign to appimagetool
+          #   APPIMAGETOOL_SIGN_PASSPHRASE  appimagetool uses this to unlock the GPG key non-interactively
+          #   SIGN_KEY                      appimagetool picks the key matching this fingerprint
+          # Without SIGN=1, the other two are ignored and the AppImage is built unsigned even if a key is present.
+          SIGN: "1"
+          APPIMAGETOOL_SIGN_PASSPHRASE: ${{ secrets.RELEASE_GPG_PASSPHRASE }}
+          SIGN_KEY: ${{ vars.RELEASE_GPG_FINGERPRINT }}
           TAURI_SIGNING_PRIVATE_KEY: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY }}
           TAURI_SIGNING_PRIVATE_KEY_PASSWORD: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY_PASSWORD }}
           VITE_SUPABASE_PUBLISHABLE_DEFAULT_KEY: ${{ secrets.VITE_SUPABASE_PUBLISHABLE_DEFAULT_KEY || 'sb_publishable_UHz2SVRF5mvdrPHWkRteyA_yNlZTkYb' }}
@@ -432,6 +459,16 @@ jobs:
           tauriScript: npx tauri
           args: ${{ matrix.args }}
 
+      - name: Clear release GPG key from runner keyring (Linux)
+        if: always() && matrix.platform == 'ubuntu-22.04'
+        env:
+          RELEASE_GPG_FINGERPRINT: ${{ vars.RELEASE_GPG_FINGERPRINT }}
+        run: |
+          if [ -n "$RELEASE_GPG_FINGERPRINT" ]; then
+            gpg --batch --yes --delete-secret-keys "$RELEASE_GPG_FINGERPRINT" || true
+            gpg --batch --yes --delete-keys "$RELEASE_GPG_FINGERPRINT" || true
+          fi
+
       # Verify the MSI (outer wrapper users download) AND the inner exe extracted
       # from it (what actually gets installed and what AV scans). We don't check
       # target/.../release/stirling-pdf.exe - that's Tauri's intermediate build
@@ -525,6 +562,7 @@ jobs:
             find . -name "*.app" -exec cp -r {} "../../../dist/Stirling-PDF-${{ matrix.name }}.app" \;
           else
             find . -name "*.deb" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.deb" \;
+            find . -name "*.rpm" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.rpm" \;
             find . -name "*.AppImage" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.AppImage" \;
           fi
 
@@ -585,6 +623,7 @@ jobs:
             ./artifacts/**/*.msi
             ./artifacts/**/*.dmg
             ./artifacts/**/*.deb
+            ./artifacts/**/*.rpm
             ./artifacts/**/*.AppImage
           draft: false
           prerelease: false

.github/workflows/tauri-build.yml

@@ -292,6 +292,26 @@ jobs:
           }
           EOF
 
+      - name: Import release GPG signing key (Linux)
+        if: matrix.platform == 'ubuntu-22.04'
+        env:
+          RELEASE_GPG_PRIVATE_KEY: ${{ secrets.RELEASE_GPG_PRIVATE_KEY }}
+        run: |
+          echo "$RELEASE_GPG_PRIVATE_KEY" | gpg --batch --import
+          gpg --list-secret-keys --keyid-format=long
+
+      - name: Make libjvm discoverable for linuxdeploy (Linux AppImage)
+        if: matrix.platform == 'ubuntu-22.04'
+        run: |
+          JAVA_LIBJVM="$JAVA_HOME/lib/server/libjvm.so"
+          if [ -f "$JAVA_LIBJVM" ]; then
+            sudo ln -sf "$JAVA_LIBJVM" /usr/lib/libjvm.so
+            echo "Linked libjvm from $JAVA_LIBJVM -> /usr/lib/libjvm.so"
+          else
+            echo "libjvm not found at $JAVA_LIBJVM"
+            exit 1
+          fi
+
       - name: Build Tauri app
         uses: tauri-apps/tauri-action@51a9f1156b33df106d827c3a78f8f894946c5faa # v0.5.25
         env:
@@ -302,7 +322,14 @@ jobs:
           APPLE_ID: ${{ secrets.APPLE_ID }}
           APPLE_PASSWORD: ${{ secrets.APPLE_ID_PASSWORD }}
           APPLE_TEAM_ID: ${{ secrets.APPLE_TEAM_ID }}
-          APPIMAGETOOL_SIGN_PASSPHRASE: ${{ secrets.APPIMAGETOOL_SIGN_PASSPHRASE }}
+          # AppImage signing — three env vars work together:
+          #   SIGN=1                        tells linuxdeploy-plugin-appimage to forward --sign to appimagetool
+          #   APPIMAGETOOL_SIGN_PASSPHRASE  appimagetool uses this to unlock the GPG key non-interactively
+          #   SIGN_KEY                      appimagetool picks the key matching this fingerprint
+          # Without SIGN=1, the other two are ignored and the AppImage is built unsigned even if a key is present.
+          SIGN: "1"
+          APPIMAGETOOL_SIGN_PASSPHRASE: ${{ secrets.RELEASE_GPG_PASSPHRASE }}
+          SIGN_KEY: ${{ vars.RELEASE_GPG_FINGERPRINT }}
           TAURI_SIGNING_PRIVATE_KEY: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY }}
           TAURI_SIGNING_PRIVATE_KEY_PASSWORD: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY_PASSWORD }}
           VITE_SUPABASE_PUBLISHABLE_DEFAULT_KEY: ${{ secrets.VITE_SUPABASE_PUBLISHABLE_DEFAULT_KEY || 'sb_publishable_UHz2SVRF5mvdrPHWkRteyA_yNlZTkYb' }}
@@ -315,6 +342,16 @@ jobs:
           tauriScript: npx tauri
           args: ${{ matrix.args }}
 
+      - name: Clear release GPG key from runner keyring (Linux)
+        if: always() && matrix.platform == 'ubuntu-22.04'
+        env:
+          RELEASE_GPG_FINGERPRINT: ${{ vars.RELEASE_GPG_FINGERPRINT }}
+        run: |
+          if [ -n "$RELEASE_GPG_FINGERPRINT" ]; then
+            gpg --batch --yes --delete-secret-keys "$RELEASE_GPG_FINGERPRINT" || true
+            gpg --batch --yes --delete-keys "$RELEASE_GPG_FINGERPRINT" || true
+          fi
+
       - name: Verify notarization (macOS only)
         if: matrix.platform == 'macos-15' || matrix.platform == 'macos-15-intel'
         run: |
@@ -345,6 +382,7 @@ jobs:
             find . -name "*.dmg" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.dmg" \;
           else
             find . -name "*.deb" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.deb" \;
+            find . -name "*.rpm" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.rpm" \;
             find . -name "*.AppImage" -exec cp {} "../../../dist/Stirling-PDF-${{ matrix.name }}.AppImage" \;
           fi
 
@@ -442,8 +480,8 @@ jobs:
             fi
           else
             echo "Checking for Linux artifacts..."
-            find . -name "*.deb" -o -name "*.AppImage" | head -5
+            find . -name "*.deb" -o -name "*.rpm" -o -name "*.AppImage" | head -5
-            if [ $(find . -name "*.deb" -o -name "*.AppImage" | wc -l) -eq 0 ]; then
+            if [ $(find . -name "*.deb" -o -name "*.rpm" -o -name "*.AppImage" | wc -l) -eq 0 ]; then
               echo "❌ No Linux artifacts found"
               exit 1
             fi
@@ -456,7 +494,7 @@ jobs:
         run: |
           cd ./frontend/src-tauri/target
           echo "Artifact sizes for ${{ matrix.name }}:"
-          find . -name "*.exe" -o -name "*.dmg" -o -name "*.deb" -o -name "*.AppImage" -o -name "*.msi" | while read file; do
+          find . -name "*.exe" -o -name "*.dmg" -o -name "*.deb" -o -name "*.rpm" -o -name "*.AppImage" -o -name "*.msi" | while read file; do
             if [ -f "$file" ]; then
               size=$(stat -c%s "$file" 2>/dev/null || stat -f%z "$file" 2>/dev/null || echo "unknown")
               echo "$file: $size bytes"
@@ -500,7 +538,7 @@ jobs:
               'Stirling-PDF-windows-x86_64': { icon: '🪟', platform: 'Windows x64', files: '.exe, .msi' },
               'Stirling-PDF-macos-aarch64': { icon: '🍎', platform: 'macOS ARM64', files: '.dmg' },
               'Stirling-PDF-macos-x86_64': { icon: '🍎', platform: 'macOS Intel', files: '.dmg' },
-              'Stirling-PDF-linux-x86_64': { icon: '🐧', platform: 'Linux x64', files: '.deb, .AppImage' }
+              'Stirling-PDF-linux-x86_64': { icon: '🐧', platform: 'Linux x64', files: '.deb, .rpm, .AppImage' }
             };
 
             let commentBody = `## 📦 Tauri Desktop Builds Ready!\n\n`;

.gitignore

@@ -217,6 +217,9 @@ id_ecdsa.pub
 id_ed25519
 id_ed25519.pub
 .ssh/
+
+# Allow the published GPG release signing public key (safe to share)
+!docs/security/signing-key.pub
 *ssh
 
 # Taskfile checksum cache

docs/security/VERIFYING_RELEASES.md

@@ -0,0 +1,114 @@
+# Verifying Stirling-PDF Release Artifacts
+
+Every Linux release artifact (`.AppImage`, `.rpm`, `.deb`) is signed with the
+**Stirling-PDF release signing key**. Users are encouraged to verify downloads
+before running them, especially when obtaining Stirling-PDF from a mirror,
+redistributor, or any source other than the official
+[GitHub Releases page](https://github.com/Stirling-Tools/Stirling-PDF/releases).
+
+## Signing key
+
+| Field        | Value                                              |
+|--------------|----------------------------------------------------|
+| User ID      | `Stirling PDF Inc. <[email protected]>`      |
+| Fingerprint  | `EBB9 258B FEA4 7D92 342F  00DF B8C0 96A5 9BEF 2A8B` |
+| Algorithm    | RSA-4096                                           |
+| Valid until  | 2031-04-16                                         |
+
+The public key is committed to this repository at
+[`docs/security/signing-key.pub`](signing-key.pub) and is also published on:
+
+- https://keys.openpgp.org/search?q=EBB9258BFEA47D92342F00DFB8C096A59BEF2A8B
+- https://keyserver.ubuntu.com/pks/lookup?op=get&search=0xEBB9258BFEA47D92342F00DFB8C096A59BEF2A8B
+
+Cross-checking the fingerprint from two independent sources (the repository and
+a keyserver) is the recommended way to be sure you've obtained the genuine key.
+
+## One-time setup — import the public key
+
+```bash
+# Option 1 — from the repo over HTTPS
+curl -fsSL https://raw.githubusercontent.com/Stirling-Tools/Stirling-PDF/main/docs/security/signing-key.pub \
+  | gpg --import
+
+# Option 2 — from a keyserver
+gpg --keyserver hkps://keys.openpgp.org \
+    --recv-keys EBB9258BFEA47D92342F00DFB8C096A59BEF2A8B
+```
+
+Confirm the fingerprint matches after import:
+
+```bash
+gpg --fingerprint [email protected]
+# Expected: EBB9 258B FEA4 7D92 342F  00DF B8C0 96A5 9BEF 2A8B
+```
+
+## Verifying an `.AppImage`
+
+Tauri's AppImage bundler embeds the signature inside the AppImage itself via
+`appimagetool --sign`. Extract and verify:
+
+```bash
+# --appimage-signature prints the embedded signature
+./Stirling-PDF_*.AppImage --appimage-signature > sig.asc
+./Stirling-PDF_*.AppImage --appimage-offset                  # shows the offset
+# Verify the payload signature against the key
+gpg --verify sig.asc Stirling-PDF_*.AppImage
+```
+
+A successful result looks like:
+
+```
+gpg: Good signature from "Stirling PDF Inc. <[email protected]>" [ultimate]
+```
+
+## Verifying an `.rpm`
+
+RPM signatures are verified via `rpm --checksig`:
+
+```bash
+# Import the key into rpm's keyring
+sudo rpm --import docs/security/signing-key.pub   # if working from a clone
+# OR
+sudo rpm --import https://raw.githubusercontent.com/Stirling-Tools/Stirling-PDF/main/docs/security/signing-key.pub
+
+# Verify the package
+rpm --checksig Stirling-PDF-*.rpm
+# Expected output ends with: "digests signatures OK"
+```
+
+## Verifying a `.deb`
+
+Debian packages are signed with a detached `.asc` file distributed alongside
+the `.deb` on the release page:
+
+```bash
+gpg --verify Stirling-PDF-*.deb.asc Stirling-PDF-*.deb
+```
+
+## What if verification fails?
+
+A failed signature check means **do not install the file**. Possible causes:
+
+- The download was corrupted — try again from the
+  [official releases](https://github.com/Stirling-Tools/Stirling-PDF/releases).
+- You obtained the file from a malicious mirror — get it from the official
+  source.
+- The signing key has rotated — check this document on the latest `main` for
+  the current fingerprint.
+
+If none of those explain it, please open a security report at
+https://github.com/Stirling-Tools/Stirling-PDF/security/advisories/new.
+
+## Key rotation policy
+
+The signing key expires on **2031-04-16**. We will publish a new key at least
+six months before expiry. The transition process:
+
+1. A new key is announced in release notes and this document is updated.
+2. The last few releases will be co-signed with both the old and new keys.
+3. The old key is published with a revocation notice once the transition is
+   complete.
+
+If the signing key is ever compromised, a revocation certificate will be
+published immediately to both keyservers and to this document.

docs/security/signing-key.pub

@@ -0,0 +1,52 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+=vzHS
+-----END PGP PUBLIC KEY BLOCK-----

frontend/src-tauri/stirling-pdf.desktop

@@ -3,7 +3,8 @@ Version=1.0
 Type=Application
 Name=Stirling-PDF
 Comment=Locally hosted web application that allows you to perform various operations on PDF files
-Exec=/usr/bin/stirling-pdf
+TryExec={{exec}}
+Exec={{exec}} %F
 Icon={{icon}}
 Terminal=false
 MimeType=application/pdf;
@@ -12,4 +13,4 @@ Actions=open-file;
 
 [Desktop Action open-file]
 Name=Open PDF File
-Exec=/usr/bin/stirling-pdf %F
+Exec={{exec}} %F

frontend/src-tauri/tauri.conf.json

@@ -24,7 +24,7 @@
   "bundle": {
     "active": true,
     "publisher": "Stirling PDF Inc.",
-    "targets": ["deb", "rpm", "dmg", "msi"],
+    "targets": ["deb", "rpm", "appimage", "dmg", "msi"],
     "icon": [
       "icons/icon.png",
       "icons/icon.icns",
@@ -47,6 +47,12 @@
     "linux": {
       "deb": {
         "desktopTemplate": "stirling-pdf.desktop"
+      },
+      "rpm": {
+        "desktopTemplate": "stirling-pdf.desktop"
+      },
+      "appimage": {
+        "bundleMediaFramework": false
       }
     },
     "windows": {