Update Danger workflow to use reusable workflow.

Migrate from inline Danger workflow steps to numbata/danger-pr-comment reusable workflow for better maintainability and consistency.

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

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: dblock

.github/workflows/danger-comment.yml

@@ -0,0 +1,10 @@
+name: Danger Comment
+on:
+  workflow_run:
+    workflows: [Danger]
+    types: [completed]
+
+jobs:
+  comment:
+    uses: numbata/danger-pr-comment/.github/workflows/danger-comment.yml@main
+    secrets: inherit

.github/workflows/danger.yml

@@ -1,22 +1,9 @@
----
-name: danger
+name: Danger
 on:
   pull_request:
     types: [opened, reopened, edited, synchronize]
+
 jobs:
   danger:
-    runs-on: ubuntu-20.04
-    steps:
-    - uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-    - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
-      with:
-        ruby-version: 2.7
-        bundler-cache: true
-    - name: Run Danger
-      run: |
-        # the personal token is public, this is ok, base64 encode to avoid tripping Github
-        TOKEN=$(echo -n Z2hwX0xNQ3VmanBFeTBvYkZVTWh6NVNqVFFBOEUxU25abzBqRUVuaAo= | base64 --decode)
-        DANGER_GITHUB_API_TOKEN=$TOKEN bundle exec danger --verbose
+    uses: numbata/danger-pr-comment/.github/workflows/danger-run.yml@main
+    secrets: inherit

Dangerfile

@@ -1,4 +1,6 @@
 # frozen_string_literal: true
 
+danger.import_dangerfile(gem: 'danger-pr-comment')
+
 changelog.check!
 toc.check!

Gemfile

@@ -8,8 +8,9 @@ gem 'rake'
 
 group :development, :test do
   gem 'danger'
-  gem 'danger-changelog', '0.6.1'
-  gem 'danger-toc', '0.2.0'
+  gem 'danger-changelog'
+  gem 'danger-toc'
+  gem 'danger-pr-comment'
   gem 'rspec', '~> 3.0'
   gem 'rubocop', '~> 1.0'
   gem 'rubocop-rake'