Update CI

Signed-off-by: Khanh Ngo <khanh.ngo@taxfix.de>

.github/workflows/build-and-publish.yml

@@ -25,9 +25,6 @@ jobs:
             type=semver,pattern={{major}}.{{minor}}
             type=semver,pattern={{major}}
 
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v1
-
       - name: Set up Docker Buildx
         id: buildx
         uses: docker/setup-buildx-action@v1
@@ -42,7 +39,8 @@ jobs:
         uses: docker/build-push-action@v2
         if: github.ref == 'refs/heads/master'
         with:
-          context: ./docker
+          context: ./
+          file: ./docker/Dockerfile
           push: true
           tags: ngoduykhanh/powerdns-admin:latest
 
@@ -50,6 +48,7 @@ jobs:
         uses: docker/build-push-action@v2
         if: ${{ github.event_name == 'create' && github.event.ref_type == 'tag' }}
         with:
-          context: ./docker
+          context: ./
+          file: ./docker/Dockerfile
           push: true
           tags: ${{ steps.meta.outputs.tags }}