ci: add aarch64

.github/workflows/flatpak.yml

@@ -26,11 +26,25 @@ jobs:
     container:
       image: bilelmoussaoui/flatpak-github-actions:gnome-nightly
       options: --privileged
+    strategy:
+      matrix:
+        arch: [x86_64, aarch64]
+      # Don't fail the whole workflow if one architecture fails
+      fail-fast: false
     steps:
       - name: Checkout
         uses: actions/checkout@v3
+      - name: Install deps
+        run: |
+          dnf -y install docker
+      - name: Set up QEMU
+        id: qemu
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: arm64
       - uses: bilelmoussaoui/flatpak-github-actions/flatpak-builder@v4
         with:
           bundle: com.github.GradienceTeam.Gradience.flatpak
           manifest-path: com.github.GradienceTeam.Gradience.json
           cache-key: flatpak-builder-${{ github.sha }}
+          arch: ${{ matrix.arch }}