GitHub Actions: do not deploy to maven central from master branch

Author: DevCharly

.github/workflows/ci.yml

@@ -66,7 +66,8 @@ jobs:
     needs: build
     if: |
       github.event_name == 'push' &&
-      (startsWith( github.ref, 'refs/tags/' ) || github.ref == 'refs/heads/master') &&
+      startsWith( github.ref, 'refs/tags/' ) &&
+      endsWith( github.ref, '-formdev' ) &&
       github.repository == 'JFormDesigner/svgSalamander'
 
     steps: