chore: add release-please GitHub action

.github/workflows/release.yml

@@ -0,0 +1,35 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write
+  pull-requests: write
+  id-token: write
+
+jobs:
+  release:
+    if: github.repository == 'tremendous-rewards/tremendous-ruby'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: googleapis/release-please-action@v4
+        id: release
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          release-type: ruby
+
+      - uses: actions/checkout@v4
+        if: ${{ steps.release.outputs.release_created }}
+
+      - name: Use Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.3
+          bundler-cache: true
+        if: ${{ steps.release.outputs.release_created }}
+
+      - uses: rubygems/release-gem@v1
+        if: ${{ steps.release.outputs.release_created }}