Update push-docker-image.yaml

Author: amirhnajafiz

Diff for: .github/workflows/push-docker-image.yaml

@@ -21,14 +21,14 @@ jobs:
       - name: Log in to Docker Hub
         uses: docker/login-action@v2
         with:
-          username: $DOCKER_USER
-          password: $DOCKER_PASSWORD
+          username: ${{ env.DOCKER_USER }}
+          password: ${{ env.DOCKER_PASSWORD }}
 
       - name: Extract metadata (tags, labels) for Docker
         id: meta
         uses: docker/metadata-action@9ec57ed1fcdbf14dcef7dfbe97b2010124a938b7
         with:
-          images: $DOCKER_USER/$REPO_NAME
+          images: ${{ env.DOCKER_USER }}/${{ env.REPO_NAME }}
 
       - name: Build and push Docker image
         uses: docker/build-push-action@3b5e8027fcad23fda98b2e3ac259d8d67585f671