ci: auto-publish gem from release-please run (hexlet-ide pattern)

.github/workflows/publish-gem.yml

@@ -1,13 +1,11 @@
-# This workflow is triggered when a GitHub release is created.
-# It can also be run manually to re-publish to rubygems.org in case it failed for some reason.
-# You can run this workflow by navigating to https://www.github.com/Hexlet/cloudpayments-ruby/actions/workflows/publish-gem.yml
+# Manual fallback to (re-)publish a gem version to rubygems.org.
+# The normal release flow publishes from the `release.yml` workflow's `publish` job.
+# Run this manually only if that publish step needs to be retried for an existing release.
+# Navigate to https://www.github.com/Hexlet/cloudpayments-ruby/actions/workflows/publish-gem.yml
 name: Publish Gem
 on:
   workflow_dispatch:
 
-  release:
-    types: [published]
-
 jobs:
   publish:
     name: publish

.github/workflows/release.yml

@@ -0,0 +1,50 @@
+name: Release Please
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  release-please:
+    runs-on: ubuntu-latest
+    if: github.repository == 'Hexlet/cloudpayments-ruby'
+
+    permissions:
+      contents: write
+      pull-requests: write
+
+    outputs:
+      release_created: ${{ steps.release.outputs.release_created }}
+      version: ${{ steps.release.outputs.tag_name }}
+
+    steps:
+      - uses: googleapis/release-please-action@v5
+        id: release
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          config-file: release-please-config.json
+          manifest-file: .release-please-manifest.json
+
+  publish:
+    needs: release-please
+    if: needs.release-please.outputs.release_created == 'true'
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: false
+
+      - run: |-
+          bundle install
+
+      - name: Publish to RubyGems.org
+        run: bash ./bin/publish-gem
+        env:
+          # `RUBYGEMS_HOST` is only required for private gem repositories, not https://rubygems.org
+          RUBYGEMS_HOST: ${{ secrets.CLOUDPAYMENTS_RUBYGEMS_HOST || secrets.RUBYGEMS_HOST }}
+          GEM_HOST_API_KEY: ${{ secrets.CLOUDPAYMENTS_GEM_HOST_API_KEY || secrets.GEM_HOST_API_KEY }}