ci(docker push): missing Buildx setup

Author: ChakshuGautam

.github/workflows/docker-push.yml

@@ -19,12 +19,16 @@ jobs:
           username: ${{ secrets.DOCKER_HUB_USERNAME }}
           password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
 
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+      
       - name: Build and push
         id: docker_build
         uses: docker/build-push-action@v2
         with:
           push: true
-          tags: samagragovernance/esamwad-user-service:latest, samagragovernance/esamwad-user-service:${{ env.RELEASE_VERSION }}
+          tags: ${{ secrets.DOCKER_HUB_USERNAME }}/esamwad-user-service:latest, ${{ secrets.DOCKER_HUB_USERNAME }}/esamwad-user-service:${{ env.RELEASE_VERSION }}
 
       - name: Image digest
         run: echo ${{ steps.docker_build.outputs.digest }}