Only publish on tags

.github/workflows/gem-push.yml

@@ -2,9 +2,7 @@ name: Ruby Gem
 
 on:
   push:
-    branches: [ "main" ]
-  pull_request:
-    branches: [ "main" ]
+    tags: '*'
 
 jobs:
   build:
@@ -16,13 +14,13 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up Ruby 2.6
+    - name: Set up Ruby 3.3
     # To automatically get bug fixes and new Ruby versions for ruby/setup-ruby,
     # change this to (see https://github.com/ruby/setup-ruby#versioning):
     # uses: ruby/setup-ruby@v1
       uses: ruby/setup-ruby@55283cc23133118229fd3f97f9336ee23a179fcf # v1.146.0
       with:
-        ruby-version: 2.6.x
+        ruby-version: 3.3.x
 
     - name: Publish to GPR
       run: |