Delete 'only' parameter since we use rules now

.gitlab-ci.yml

@@ -60,8 +60,6 @@ build_client:
     - docker build -t $CLIENT_IMAGE_TAG .
     - docker tag $CI_COMMIT_TAG
     - docker push --all-tags $CLIENT_IMAGE_TAG
-  only: 
-    - master
 
 build_server:
   stage: build
@@ -85,5 +83,3 @@ build_server:
     - docker build -t $SERVER_IMAGE_TAG .
     - docker tag $SERVER_IMAGE_TAG $SERVER_RELEASE_IMAGE_TAG
     - docker push $SERVER_RELEASE_IMAGE_TAG
-  only: 
-    - master