ci: fix flatpak build

Author: geigi

.github/workflows/flatpak.yml

@@ -18,15 +18,17 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
+    - name: Install deps
+      run: |
+        dnf -y install docker
+      if: ${{ matrix.arch == 'aarch64' }}
+
     - name: Set up QEMU
       id: qemu
       uses: docker/setup-qemu-action@v1
       with:
         platforms: arm64
-    
-    - name: Install deps
-      run: |
-        dnf -y install docker
+      if: ${{ matrix.arch == 'aarch64' }}
 
     - uses: bilelmoussaoui/flatpak-github-actions/flatpak-builder@v4
       with: