initial ci check

.github/workflows/build_all.yml

@@ -55,4 +55,17 @@ jobs:
       os: ${{ matrix.os }}
       arch: ${{ matrix.arch }}
       build-deps-only: ${{ inputs.build-deps-only || false }}
-    secrets: inherit
+    secrets: inherit
+  flatpak:
+    name: "Flatpak"
+    runs-on: ubuntu-latest
+    container:
+      image: bilelmoussaoui/flatpak-github-actions:gnome-45
+      options: --privileged
+    steps:
+    - uses: actions/checkout@v4
+    - uses: flatpak/flatpak-github-actions/flatpak-builder@v6
+      with:
+        bundle: orcaslicer.flatpak
+        manifest-path: flatpak/io.github.softfever.OrcaSlicer.yml
+        cache-key: flatpak-builder-${{ github.sha }}