add QEmu to build process

This hopefully triggers the build of the non x86 images

Author: splitbrain

.github/workflows/docker-build.yml

@@ -32,6 +32,9 @@ jobs:
           npm install
           npm run build
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3