Merge pull request #5976 from Sonicadvance1/255

gitlab-ci: Only auto-promote on pushes to the main branch

.gitlab-ci.yml

@@ -57,7 +57,7 @@ promote:
     - arm64
     - aarch64
   rules:
-    - if: '$PROMOTE_BRANCH'
+    - if: '$PROMOTE_BRANCH' && $CI_COMMIT_BRANCH == 'main'
   before_script:
     - apt-get -y update
     - apt-get install -y tmux curl