deploy stage: simplify yaml syntax

.gitlab-ci.yml

@@ -43,11 +43,7 @@ executable:
 #---------------------------------------------------------------------------------------
 .deploy: &deploy
   stage: deploy
-  rules:
-    - if: $CI_MERGE_REQUEST_IID
-      when: manual
-    - if: $CI_COMMIT_BRANCH == "master"
-      when: manual
+  when: manual
   allow_failure: yes
   script:
     - cd ${CI_PROJECT_DIR}