Migrate Danger to use danger-pr-comment workflow.

Add danger, danger-changelog, and danger-pr-comment gems to Gemfile. Create Dangerfile with changelog.check! and GitHub Actions workflows for danger-pr-comment integration.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <[email protected]>

Author: dblock

.github/workflows/danger-comment.yml

@@ -0,0 +1,11 @@
+name: Danger Comment
+
+on:
+  workflow_run:
+    workflows: [Danger]
+    types: [completed]
+
+jobs:
+  comment:
+    uses: numbata/danger-pr-comment/.github/workflows/[email protected]
+    secrets: inherit

.github/workflows/danger.yml

@@ -0,0 +1,13 @@
+name: Danger
+
+on:
+  pull_request:
+    types: [opened, reopened, edited, synchronize]
+
+jobs:
+  danger:
+    uses: numbata/danger-pr-comment/.github/workflows/[email protected]
+    secrets: inherit
+    with:
+      ruby-version: '3.2'
+      bundler-cache: true

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## 7.1.0 (Next)
 
+* [#277](https://github.com/mongoid/mongoid-slug/pull/277): Migrate Danger to use danger-pr-comment workflow - [@dblock](https://github.com/dblock)
 * [#274](https://github.com/mongoid/mongoid-slug/pull/274): Added support for scoping slugs by multiple fields - [@mikekosulin](https://github.com/mikekosulin)
 * Your contribution here.
 

Dangerfile

@@ -0,0 +1,5 @@
+# frozen_string_literal: true
+
+danger.import_dangerfile(gem: 'danger-pr-comment')
+
+changelog.check!

Gemfile

@@ -13,6 +13,9 @@ else
   gem 'mongoid', version
 end
 
+gem 'danger', require: false
+gem 'danger-changelog', require: false
+gem 'danger-pr-comment', require: false
 gem 'rake'
 gem 'rspec'
 gem 'rspec-its'