Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -35,13 +35,13 @@ maven-compile:
 #   # DinD service is required for Testcontainers
 #   services:
 #     - docker:dind
-# 
+#
 #   variables:
 #     # Instruct Testcontainers to use the daemon of DinD.
 #     DOCKER_HOST: 'tcp://docker:2375'
 #     # Improve performance with overlayfs.
 #     DOCKER_DRIVER: overlay2
-# 
+#
 #   stage: test
 #   script:
 #     - ./mvnw -ntp verify -P-webpack -Dmaven.repo.local=$MAVEN_USER_HOME -Dspring.profiles.active=testcontainers
@@ -78,6 +78,8 @@ maven-package:
 # Uncomment the following line to use gitlabs container registry. You need to adapt the REGISTRY_URL in case you are not using gitlab.com
 docker-push:
     stage: release
+    only:
+      - master
     variables:
         REGISTRY_URL: docker.uibk.ac.at:443
         IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG-$CI_COMMIT_SHA