ci(build): allow deployment to central repository only from master branch

Author: iseki0

.github/workflows/build.yml

@@ -39,7 +39,7 @@ jobs:
         run: echo "${{ secrets.GPG_PK }}" | base64 --decode | gpg --import
 
       - name: Publish to Maven Central
-        if: ${{ !startsWith(github.ref, 'refs/tags/v') }}
+        if: ${{ !startsWith(github.ref, 'refs/tags/v') && github.ref == 'refs/heads/master' }}
         env:
           OSSRH_USERNAME: ${{ secrets.OSSRH_USERNAME }}
           OSSRH_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}