GitLab CI: only publish image on develop

.gitlab-ci.yml

@@ -144,14 +144,15 @@ pages:
       - develop
 
 docker:
+  stage: deploy
   image: docker:20.10.17
   services:
-    - docker:20.10.17-dind       
+    - docker:20.10.17-dind
   # https://medium.com/devops-with-valentine/how-to-build-a-docker-image-and-push-it-to-the-gitlab-container-registry-from-a-gitlab-ci-pipeline-acac0d1f26df
   script:
     - echo $CI_REGISTRY_PASSWORD | docker login -u $CI_REGISTRY_USER $CI_REGISTRY --password-stdin
     - docker build -t $CI_REGISTRY_IMAGE .
     - docker push $CI_REGISTRY_IMAGE
-  # only:
-  #   refs:
-  #     - develop
+  only:
+    refs:
+      - develop