Add docker private actions support buildx

.github/workflows/docker-private.yml

@@ -12,6 +12,7 @@ jobs:
     env:
       REGISTRY: ${{ secrets.DOCKER_REGISTRY }}
     steps:
+      - uses: docker/setup-buildx-action@v1
       - uses: actions/checkout@v1
       - name: Sign-in to Private Registry "${REGISTRY}"
         run: docker login $REGISTRY -u ${{ secrets.DOCKER_USERNAME }} -p ${{ secrets.DOCKER_PASSWORD }}

.github/workflows/docker-public.yml

@@ -3,7 +3,7 @@ name: Docker CI Public
 on:
   push:
     branches:
-      - 'main'
+      - main
 
 jobs:
   docker: