ci(actions): enable docker buildkit

Signed-off-by: rjshrjndrn <rjshrjndrn@gmail.com>

.github/workflows/frontend.yaml

@@ -48,7 +48,8 @@ jobs:
       run: |
         cd frontend
         docker run --rm -v /etc/passwd:/etc/passwd -u `id -u`:`id -g` -v $(pwd):/home/${USER} -w /home/${USER} --name node_build node:14-stretch-slim /bin/bash -c "yarn && yarn build"
-        docker build --target=cicd -t $DOCKER_REPO/frontend:${IMAGE_TAG} .
+        # https://github.com/docker/cli/issues/1134#issuecomment-613516912
+        DOCKER_BUILDKIT=1 docker build --target=cicd -t $DOCKER_REPO/frontend:${IMAGE_TAG} .
         docker push $DOCKER_REPO/frontend:${IMAGE_TAG}
     - name: Creating old image input
       run: |