Add flatpak ci

.github/workflows/flatpak.yml

@@ -0,0 +1,20 @@
+name: Flatpak
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+jobs:
+    flatpak:
+      name: "Flatpak"
+      runs-on: ubuntu-latest
+      container:
+        image: bilelmoussaoui/flatpak-github-actions:gnome-45
+        options: --privileged
+      steps:
+      - uses: actions/checkout@v4
+      - uses: flatpak/flatpak-github-actions/flatpak-builder@v6
+        with:
+          bundle: goldwarden.flatpak
+          manifest-path: com.quexten.Goldwarden.yml
+          cache-key: flatpak-builder-${{ github.sha }}