fix: only run job on master

Author: eduwer-cp

.gitlab-ci.yml

@@ -6,7 +6,6 @@ build_and_deploy:
   when: manual
   rules:
     - if: $CI_COMMIT_REF_NAME == $CI_DEFAULT_BRANCH
-    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
   image:
     name: gitlab.codingame.com:5050/codingame/tools/build-release:master
     entrypoint: [""]