Add GitHub Actions workflow for Snapcraft and AppImage builds

Author: codecliff

.github/workflows/snap_appimage.yml

@@ -0,0 +1,101 @@
+name: Build and Release PhotoGlimmer
+
+on:
+  workflow_dispatch:
+    inputs:
+      release_type:
+        description: 'Type of release'
+        required: true
+        default: 'beta'
+        type: choice
+        options:
+          - beta
+          - stable
+
+jobs:
+  # 1. VERSION EXTRACTION
+  get-version:
+    runs-on: ubuntu-latest
+    outputs:
+      version: ${{ steps.extract.outputs.version }}
+    steps:
+      - uses: actions/checkout@v4
+      - id: extract
+        run: |
+          # Use the robust sed logic to pull version from Interfaces.py
+          V=$(sed -n 's/^APP_VERSION.*=.*["'\'']\([^"'\'']*\)["'\''].*/\1/p' src/photoglimmer/backend/Interfaces.py)
+          echo "version=$V" >> $GITHUB_OUTPUT
+
+  # 2. SNAP BUILD
+  build-snap:
+    needs: get-version
+    runs-on: ubuntu-24.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build Snap
+        uses: snapcore/action-build@v1
+        with:
+          path: src/ # Runs from src/ 
+          snapcraft-args: pack --destructive-mode
+      - uses: actions/upload-artifact@v4
+        with:
+          name: photoglimmer-snap
+          path: src/*.snap
+
+  # 3. APPIMAGE BUILD
+  build-appimage:
+    needs: get-version
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python 3.12.3
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12.3'
+      - name: Install System Dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y desktop-file-utils libgdk-pixbuf2.0-dev
+      - name: Build AppImage
+        working-directory: src/appimage
+        run: |
+          # Inject version into environment for the recipe
+          export APP_VERSION=${{ needs.get-version.outputs.version }}
+          python -m venv appimage_venv
+          source appimage_venv/bin/activate
+          pip install appimage-builder packaging==20.9
+          appimage-builder --recipe AppImageBuilder.yml
+      - uses: actions/upload-artifact@v4
+        with:
+          name: photoglimmer-appimage
+          path: src/appimage/*.AppImage
+
+  # 4. UNIFIED RELEASE
+  create-release:
+    needs: [get-version, build-snap, build-appimage]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write # Mandatory for creating releases
+    steps:
+      - name: Download Artifacts
+        uses: actions/download-artifact@v4
+        with:
+          path: ./release-artifacts
+          merge-multiple: true # Flattens Snap and AppImage into one folder
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          # Uses the version  extracted in Job 1 as the Tag
+          tag_name: v${{ needs.get-version.outputs.version }}
+          name: PhotoGlimmer v${{ needs.get-version.outputs.version }} (${{ github.event.inputs.release_type }})
+          body: |
+            Automated build for PhotoGlimmer version ${{ needs.get-version.outputs.version }}.
+            Type: ${{ github.event.inputs.release_type }}
+          draft: false
+          prerelease: ${{ github.event.inputs.release_type == 'beta' }}
+          files: |
+            ./release-artifacts/*.snap
+            ./release-artifacts/*.AppImage
+          generate_release_notes: true
+