release: add support for Trusted Publishing

Author: kou

.github/workflows/release.yml

@@ -28,3 +28,21 @@ jobs:
             --title "${title}"
         env:
           GH_TOKEN: ${{ github.token }}
+
+  rubygems:
+    name: RubyGems
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    permissions:
+      id-token: write
+    environment: release
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ruby
+          bundler-cache: true
+      - uses: rubygems/configure-rubygems-credentials@v1.0.0
+      - name: Push gems
+        run: |
+          bundle exec rake release:rubygem_push

Rakefile

@@ -66,3 +66,13 @@ end
 
 desc "Run all benchmarks"
 task :benchmark => benchmark_tasks
+
+release_task = Rake.application["release"]
+# We use Trusted Publishing.
+release_task.prerequisites.delete("build")
+release_task.prerequisites.delete("release:rubygem_push")
+release_task_comment = release_task.comment
+if release_task_comment
+  release_task.clear_comments
+  release_task.comment = release_task_comment.gsub(/ and build.*$/, "")
+end