Add workflow to publish to rubygems.org

Adds workflow to publish to rubygems.org

Author: HeyNonster

.github/workflows/publish.yml

@@ -0,0 +1,12 @@
+name: Publish Gem
+
+on:
+  push:
+    tags: v*
+
+jobs:
+  call-workflow:
+    uses: zendesk/gw/.github/workflows/ruby-gem-publication.yml@main
+    secrets:
+      RUBY_GEMS_API_KEY: ${{ secrets.RUBY_GEMS_API_KEY }}
+      RUBY_GEMS_TOTP_DEVICE: ${{ secrets.RUBY_GEMS_TOTP_DEVICE }}