Merge pull request #6 from yas-okadatech/add-permission

add permission to GitHub Actions

.github/workflows/main.yml

@@ -12,6 +12,10 @@ on:
       - "master"
     types: [opened, synchronize]
 
+permissions:
+  contents: read
+  packages: write
+
 jobs:
   main:
     runs-on: ubuntu-latest
@@ -36,6 +40,7 @@ jobs:
           ruby-version: jruby
       - name: push gem
         uses: trocco-io/push-gem-to-gpr-action@v1
+        if: startsWith( github.ref, 'refs/tags/' ) || github.event_name == 'workflow_dispatch'
         with:
           language: java
           gem-path: "./build/gems/*.gem"