Add release workflow

Author: rubiii

.github/workflows/release.yml

@@ -0,0 +1,28 @@
+name: Release
+
+on:
+  workflow_dispatch:
+
+jobs:
+  push:
+    name: Push gem to RubyGems.org
+    runs-on: ubuntu-latest
+
+    permissions:
+      id-token: write
+      contents: write
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@09a7688d3b55cf0e976497ff046b70949eeaccfd # v1.288.0
+        with:
+          ruby-version: ruby
+          bundler-cache: true
+
+      - name: Release gem
+        uses: rubygems/release-gem@1c162a739e8b4cb21a676e97b087e8268d8fc40b # v1.1.2