Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -11,6 +11,10 @@ stages:
   - test
   - package
   - deploy
+  
+.only-master:
+  only:
+   - master
 
 build:
   stage: build
@@ -30,9 +34,7 @@ test:
 package:
   stage: package
   needs: [ 'test' ]
-  only:
-    refs:
-      - master
+  extends: .only-master
   variables:
     PACKAGE_CONTAINER_NAME: "cre_backend_package-$CI_COMMIT_REF_NAME"
     ARTIFACT_NAME: "ColorRecipesExplorer-backend-$CI_PIPELINE_IID"
@@ -54,9 +56,7 @@ deploy:
   stage: deploy
   image: alpine:latest
   needs: [ 'package' ]
-  only:
-    refs:
-      - master
+  extends: .only-master
   variables:
     DEPLOYED_CONTAINER_NAME: "cre_backend-$CI_COMMIT_REF_NAME"
   before_script: