feat: make sure that the tagging runs only on latest

.gitlab-ci.yml

@@ -37,14 +37,15 @@ pages:
     - public
 
 # This will tag the repository when the version-file changes and the theme successfully builds
-tag:
+auto-tag:
   stage: deploy
   variables:
     VERSION_FILE: "lib/jekyll-theme-lcsb-default.rb"
-  rules:
-    # Run only on branch named "latest"
-    - if: $CI_COMMIT_BRANCH == "latest"
+    TARGET_BRANCH: latest
   script:
+    # Make sure that it is on latest, otherwise exit
+    - [[ "${CI_COMMIT_BRANCH:-1}" == "$TARGET_BRANCH" ]] && echo "On correct branch ($CI_COMMIT_BRANCH)" || exit 0
+
     # Make sure that the version exists
     - VERSION=$(cat $VERSION_FILE | grep -o "\d\.\d\.\d")
     - '[[ -z $VERSION ]] && exit -1 || echo "OK, version appears to be correct -> $VERSION"'