ci: limit builds to tags with certain names

.gitlab-ci.yml

@@ -61,11 +61,12 @@ push_ci_registry:
     - docker push $CI_REGISTRY_IMAGE:latest
   only:
     refs:
-      - master
+      # Make sure to protect these tags!
+      - /.+-release/
     variables:
+      - $CI_REGISTRY
       - $CI_REGISTRY_USER
       - $CI_REGISTRY_PASSWORD
-      - $CI_REGISTRY
       - $CI_REGISTRY_IMAGE
 
 # Publishes the cached image to docker
@@ -83,13 +84,12 @@ push_dockerhub_registry:
     - docker tag $CI_REGISTRY_IMAGE:latest $DOCKERHUB_REGISTRY_IMAGE:latest
     - docker push $DOCKERHUB_REGISTRY_IMAGE:$CI_COMMIT_TAG
     - docker push $DOCKERHUB_REGISTRY_IMAGE:latest
-  # TODO: Use rules https://docs.gitlab.com/ee/ci/yaml/README.html#rules
   only:
     refs:
-#      - master
-      - tags
+      # Make sure to protect these tags!
+      - /.+-release/
     variables:
+      - $DOCKERHUB_REGISTRY
       - $DOCKERHUB_REGISTRY_USER
       - $DOCKERHUB_REGISTRY_PASSWORD
-      - $DOCKERHUB_REGISTRY
       - $DOCKERHUB_REGISTRY_IMAGE