chore(ci): Update docker build action

v1 seems to be deprecated, so use the v2 action.
Since this action also clones the repository during docker build, we
should not need the `checkout` action anymore.

.github/workflows/main.yml

@@ -6,15 +6,15 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-
-      - name: Build and push docker image
-        uses: docker/build-push-action@v1
+      - name: Docker Login
+        uses: docker/[email protected]
         with:
+          registry: quay.io
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
-          repository: wantedly/deployment-duplicator
+
+      - name: Build and push docker image
+        uses: docker/build-push-action@v1
+        with:
           registry: quay.io
-          tags: ${{ github.sha }}
-          tag_with_ref: true
-          tag_with_sha: true
+          tags: quay.io/wantedly/deployment-duplicator:${{ github.sha }}${{ github.event_name == 'push' && github.ref == 'refs/heads/master' && ',quay.io/wantedly/deployment-duplicator:latest' || '' }}