Update nightly.yml for arm builds

.github/workflows/nightly.yml

@@ -1,23 +1,37 @@
 name: Nightly
 
 on:
-  schedule:
-    - cron: "0 8 * * 1"
   workflow_dispatch:
   workflow_call:
 
 jobs:
   flatpak:
     runs-on: ubuntu-latest
     container:
-      image: bilelmoussaoui/flatpak-github-actions:gnome-47
+      image: bilelmoussaoui/flatpak-github-actions:gnome-46
       options: --privileged
+    strategy:
+      matrix:
+        arch: [x86_64, aarch64]
+        # Don't fail the whole workflow if one architecture fails
+      fail-fast: false
     steps:
     - uses: actions/checkout@v4
+     # Docker is required by the docker/setup-qemu-action which enables emulation
+    - name: Install deps
+      if: ${{ matrix.arch != 'x86_64' }}
+      run: |
+        dnf -y install docker
+    - name: Set up QEMU
+      if: ${{ matrix.arch != 'x86_64' }}
+      id: qemu
+      uses: docker/setup-qemu-action@v2
+      with:
+        platforms: arm64
     - uses: flatpak/flatpak-github-actions/flatpak-builder@v6
       with:
         manifest-path: build-aux/com.github.flxzt.rnote.Devel.yaml
         cache-key: flatpak-builder-${{ github.sha }}
-        arch: x86_64
         build-bundle: true
+        arch: ${{ matrix.arch }}
         bundle: com.github.flxzt.rnote.Devel.flatpak