worflow update

.github/workflows/gem-release.yml

@@ -1,13 +1,14 @@
 name: Gem Release
 
 on:
-  push:
-    branches: [ "main" ]
   pull_request:
     branches: [ "main" ]
+    types:
+      - closed
 
 jobs:
-  build:
+  if_merged:
+    if: github.event.pull_request.merged == true
     runs-on: ubuntu-latest
     name: Build + Publish with  Ruby ${{ matrix.ruby }}
     strategy:
@@ -17,8 +18,9 @@ jobs:
     permissions:
       contents: read
       packages: write
-
     steps:
+    - run: |
+        echo The PR was merged
     - uses: actions/checkout@v3
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1