Add buildx step

.github/workflows/docker-publish.yml

@@ -14,6 +14,13 @@ jobs:
       -
         name: Checkout
         uses: actions/checkout@v2
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
       -
         name: Docker meta
         id: meta