Add release workflow (#113)

Co-authored-by: mkmn <mkmn@users.noreply.github.com>

Author: mkmn

.github/workflows/release.yml

@@ -0,0 +1,24 @@
+name: Push to rubygems.org
+
+on:
+  release:
+    types:
+      - published
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      id-token: write
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          fetch-depth: 0
+          persist-credentials: false
+      - uses: ruby/setup-ruby@e65c17d16e57e481586a6a5a0282698790062f92 # v1.300.0
+        with:
+          ruby-version: '3.3'
+          rubygems: latest
+          bundler-cache: true
+      - uses: rubygems/release-gem@6317d8d1f7e28c24d28f6eff169ea854948bd9f7 # v1.2.0