bug fixed (#61)

Author: JavierBravoDonaire

.github/workflows/publish_docker_image.yml

@@ -10,7 +10,7 @@ jobs:
       - name: Log in to Docker Hub
         uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
         with:
-          username: ${{ secrets.cl }}
+          username: ${{ secrets.DOCKER_HUB_USER }}
           password: ${{ secrets.DOCKER_HUB_PASSWORD }}
 
       - name: Extract metadata (tags, labels) for Docker