Add publishing via Trusted Publishers

.github/workflows/publish.yml

@@ -0,0 +1,18 @@
+name: Publish Gem
+
+on: workflow_dispatch
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      id-token: write
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+          ruby-version: '3.2.4'
+      - uses: rubygems/release-gem@v1