Use container

.github/workflows/flatpak.yml

@@ -16,18 +16,14 @@ jobs:
     runs-on: ubuntu-latest
     env:
       ARCH: x86_64
+    container:
+      image: ghcr.io/flathub-infra/flatpak-github-actions:gnome-48
+      options: --privileged
     steps:
       - uses: actions/checkout@v4
         with:
           submodules: true
           fetch-depth: 0
-      - name: Install Flatpak tooling
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y flatpak flatpak-builder xvfb
-      - name: Add Flathub remote
-        run: |
-          flatpak remote-add --if-not-exists --user flathub https://flathub.org/repo/flathub.flatpakrepo
       - name: Get version
         id: get_version
         run: |