Allow tag beta syntax to start a release job

buildsystem/gitlab/.gitlab-ci.yml

@@ -180,10 +180,8 @@ publish_libs:
 
 release:
     extends: .build-all-base
-    only:
-        - /^(\d+\.)?(\d+\.)?(\*|\d+)$/
-    except:
-        - branches
+    rules:
+        - if: '$CI_COMMIT_TAG =~ /^(\d+\.)?(\d+\.)?(\*|\d+)/'
     script:
         - ./buildsystem/compile.sh --init
         - ./gradlew assembleRelease