ci: add release gem workflows

Author: initdc

.github/workflows/release.yml

@@ -0,0 +1,37 @@
+name: Release Gem
+
+on:
+  workflow_dispatch:
+  # release:
+  #   types:
+  #     - created
+
+concurrency:
+  group: ${{ github.sha }}
+  cancel-in-progress: true
+
+jobs:
+  push:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+      id-token: write
+
+    # If you configured a GitHub environment on RubyGems, you must use it here.
+    environment: release
+
+    steps:
+      # Set up
+      - uses: actions/checkout@v5
+        with:
+          persist-credentials: false
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+          ruby-version: ruby
+
+      - name: Release Gem
+        if: startsWith(github.ref, 'refs/tags/v')
+        uses: rubygems/release-gem@v1