Add GitHub workflow to publish gems on tag push

.github/workflows/publish_gem.yml

@@ -0,0 +1,16 @@
+name: publish_gem
+
+on:
+ push:
+ tags:
+ - '*'
+
+---
+
+- name: Publish gem
+ uses: dawidd6/action-publish-gem@v1
+ with:
+ # Optional, will publish to RubyGems if specified
+ api_key: ${{secrets.RUBYGEMS_API_KEY}}
+ # Optional, will publish to GitHub Packages if specified
+ github_token: ${{secrets.GITHUB_TOKEN}}