test Depot runners for team commits (#6394)

Co-authored-by: ConnorYoh <[email protected]>

.github/workflows/backend-build.yml

@@ -13,8 +13,14 @@ permissions:
   pull-requests: write
 
 jobs:
+  pick:
+    uses: ./.github/workflows/_runner-pick.yml
+
   build:
-    runs-on: ubuntu-latest
+    needs: pick
+    runs-on: ${{ needs.pick.outputs.is_fork == 'true' && 'ubuntu-latest' || 'depot-ubuntu-24.04-8' }}
+    env:
+      DEPOT_TOKEN: ${{ secrets.DEPOT_TOKEN }}
     strategy:
       fail-fast: false
       matrix: