[GH-7554] Automate Rubyzen releases

.github/scripts/verify_release_version.rb

@@ -0,0 +1,21 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+#
+# Verifies that lib/rubyzen/version.rb matches the release tag, so that a
+# GitHub Release can never publish a gem whose version doesn't match the tag.
+
+require_relative '../../lib/rubyzen/version'
+
+tag = ENV.fetch('RELEASE_TAG', '').strip
+version = Rubyzen::VERSION
+
+if tag.empty?
+  puts '::error::RELEASE_TAG is not set.'
+  exit 1
+elsif version == tag
+  puts "version.rb (#{version}) matches the release tag (#{tag})"
+else
+  puts "::error::version.rb (#{version}) does not match the release tag (#{tag.inspect}). " \
+       'Update lib/rubyzen/version.rb and recreate the release.'
+  exit 1
+end

.github/workflows/release.yml

@@ -0,0 +1,43 @@
+name: Release
+
+# Publishes rubyzen-lint to RubyGems when a GitHub Release is published.
+# Uses RubyGems Trusted Publishing (OIDC).
+on:
+  release:
+    types: [published]
+
+permissions:
+  contents: read
+  id-token: write
+
+jobs:
+  publish:
+    name: Build and push to RubyGems
+    runs-on: ubuntu-latest
+    environment: release
+    steps:
+      - uses: actions/checkout@v5
+        with:
+          ref: refs/tags/${{ github.event.release.tag_name }}
+          persist-credentials: false
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '3.3'
+          bundler-cache: true
+
+      - name: Run tests
+        run: bundle exec rake
+
+      - name: Verify version.rb matches the release tag
+        env:
+          RELEASE_TAG: ${{ github.event.release.tag_name }}
+        run: ruby .github/scripts/verify_release_version.rb
+
+      - name: Configure RubyGems trusted publishing
+        uses: rubygems/configure-rubygems-credentials@v2.0.0
+
+      - name: Build and push
+        run: |
+          gem build rubyzen-lint.gemspec
+          gem push rubyzen-lint-*.gem