Flatter: Add 'aarch64' multiarch build

.github/workflows/flatter.yml

@@ -14,7 +14,27 @@ jobs:
       image: bilelmoussaoui/flatpak-github-actions:freedesktop-24.08
       options: --privileged
 
+    strategy:
+      matrix:
+        arch: [x86_64, aarch64]
+      fail-fast: false
+      max-parallel: 1
+
     steps:
+      - name: Setup Docker
+        if: ${{ matrix.arch == 'aarch64' }}
+        shell: bash --noprofile --norc -eu -o pipefail -x {0}
+        run: |
+          dnf update -y
+          dnf install -y docker
+
+      - name: Setup QEMU
+        if: ${{ matrix.arch == 'aarch64' }}
+        id: qemu
+        uses: docker/setup-qemu-action@v3
+        with:
+          platforms: arm64
+
       - name: Checkout
         uses: actions/checkout@v4
         with:
@@ -31,10 +51,10 @@ jobs:
         with:
           files: |
             com.jetbrains.PhpStorm.json
-          arch: x86_64
+          arch: ${{ matrix.arch }}
           gpg-sign: ${{ steps.gpg.outputs.fingerprint }}
           upload-bundles: true
-          upload-pages-artifact: true
+          upload-pages-artifact: ${{ matrix.arch == 'aarch64' }}
           flatpak-builder-args: |
             --install-deps-from=flathub