Release gem from github actions using "trusted publishing"

To improve supply chain security

https://guides.rubygems.org/trusted-publishing/

Author: unasuke

.github/workflows/release.yml

@@ -0,0 +1,24 @@
+on:
+  push:
+    tags:
+      - v*
+
+jobs:
+  push:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+      id-token: write
+
+    steps:
+      - uses: actions/checkout@v5
+        with:
+          persist-credentials: false
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+          ruby-version: ruby
+
+      # Release
+      - uses: rubygems/release-gem@v1