Upload AppImages to GitHub Release on tag push

- Add gh release upload step with --clobber for idempotency
- Rename AppImage to include distro name for clarity
- Add contents: write permission

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Entire-Checkpoint: 792abf06fbe4

Author: facontidavide

.github/workflows/appimage.yaml

@@ -5,6 +5,9 @@ on:
     tags: ['*']
   workflow_dispatch:
 
+permissions:
+  contents: write
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
@@ -98,7 +101,16 @@ jobs:
             --appdir AppDir \
             --output appimage
 
+      - name: Rename AppImage
+        run: mv *.AppImage pj_bridge_ros2-${{ matrix.environment }}-x86_64.AppImage
+
       - uses: actions/upload-artifact@v4
         with:
           name: appimage-${{ matrix.environment }}
           path: "*.AppImage"
+
+      - name: Upload to GitHub Release
+        if: startsWith(github.ref, 'refs/tags/')
+        run: gh release upload "${{ github.ref_name }}" *.AppImage --clobber
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}