actions: replaced deprecated buildx action

replaced deprecated buildx action with official docker actions for setting up QEMU and buildx

.github/workflows/main.yml

@@ -21,12 +21,14 @@ jobs:
       - name: checkout
         uses: actions/checkout@v2
 
-      # Runs a single command using the runners shell
-      - name: install buildx
-        id: buildx
-        uses: crazy-max/ghaction-docker-buildx@v1
-        with:
-          buildx-version: latest
+      # https://github.com/docker/setup-qemu-action
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      # https://github.com/docker/setup-buildx-action
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
       - name: login docker hub
         run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
       # Runs a set of commands using the runners shell