Attempt to use setup-qemu-action to build for arm64.

.gitea/workflows/build.yaml

@@ -63,10 +63,14 @@ jobs:
           username: ${{ env.REGISTRY_USERNAME }}
           password: ${{ secrets.REGISTRY_TOKEN }}
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
       - name: Build and push image
         id: build_image
         uses: docker/build-push-action@v6
         with:
+          platforms: linux/amd64,linux/arm64
           push: true
           tags: ${{ env.REGISTRY }}/${{ env.REGISTRY_USERNAME }}/${{ env.IMAGE_NAME }}:${{ env.IMAGE_TAG }}