Add support for Trusted Publishing

.github/workflows/release.yaml

@@ -1,4 +1,4 @@
-# Copyright (C) 2024  Sutou Kouhei <kou@clear-code.com>
+# Copyright (C) 2024-2025  Sutou Kouhei <kou@clear-code.com>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -39,3 +39,20 @@ 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

@@ -1,6 +1,6 @@
-# -*- mode: ruby; coding: utf-8 -*-
+# -*- ruby -*-
 #
-# Copyright (C) 2013  Kouhei Sutou <kou@clear-code.com>
+# Copyright (C) 2013-2025  Sutou Kouhei <kou@clear-code.com>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
@@ -46,3 +46,13 @@ desc "Run tests"
 task :test do
   ruby("test/run-test.rb")
 end
+
+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