only publish tag with v prefix

Author: nothub

.github/workflows/ci.yaml

@@ -23,7 +23,7 @@ jobs:
       - run: ./gradlew --console plain --no-daemon --full-stacktrace check build
 
       - uses: softprops/action-gh-release@v2
-        if: startsWith(github.ref, 'refs/tags/')
+        if: startsWith(github.ref, 'refs/tags/v')
         with:
           body: 'automated release at commit ${{ github.sha }}'
           files: 'build/dist/*.jar'