minor refactor: avoid slow tests for trivial changes

Author: paulk-asert

.github/workflows/groovy-build-coverage.yml

@@ -22,6 +22,7 @@ permissions:
 
 jobs:
   test:
+    if: contains(github.event.head_commit.message, 'GROOVY-')
     strategy:
       fail-fast: false
     runs-on: ubuntu-latest