ci: deploy a docker debug image a each master commit

.gitlab-ci.yml

@@ -22,7 +22,7 @@ workflow:
 fmt_and_clippy:
   extends: .env
   rules:
-    - if: $CI_COMMIT_TAG
+    - if: '$CI_COMMIT_TAG || $CI_COMMIT_BRANCH == "master"'
       when: never
     - if: $CI_PIPELINE_SOURCE == "merge_request_event"
     - when: manual