Updated and reintegrated Danger into GitHub Actions CI

Summary:
Danger is the build tool we've been using to proof-check incoming PRs, including making sure the incoming change is properly documented, and if needed, running SwiftLint on incoming Swift code.

Danger was originally running in our Travis CI implementation, but it wasn't integrated when we switched to GitHub Actions.

This diff updates our Danger dependencies to the latest versions, and integrates Danger into our CI system as a separate build step. I've also modified its SwiftLint setup so it will now lint Swift files in both our sample apps, and the Swift source files in `IGListSwiftKit` itself.

Reviewed By: candance

Differential Revision: D43265158

fbshipit-source-id: 8939b821af36b544fe4d66662b6ce0f99a8f768c

Author: TimOliver

.github/workflows/CI.yml

@@ -244,3 +244,30 @@ jobs:
         run: |
           set -o pipefail
           xcodebuild build -workspace "${{ env.MACOS_EXAMPLE_WORKSPACE }}" -scheme "${{ env.EXAMPLE_SCHEME }}" -destination "${{ matrix.macOSDestination }}" ONLY_ACTIVE_ARCH=NO CODE_SIGNING_REQUIRED=NO | bundle exec xcpretty -c
+
+  Danger:
+    name: Run Danger
+    if: github.event_name == 'pull_request'
+    runs-on: macos-12
+    env:
+      DANGER_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Cache RubyGems
+        uses: actions/cache@v2
+        with:
+          path: vendor/bundle
+          key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-gems-
+
+      - name: Install ruby gems.
+        run: bundle install
+
+      - name: Run Danger
+        run: bundle exec danger --verbose
+        

Examples/.swiftlint.yml renamed to .swiftlint.yml

@@ -1,7 +1,6 @@
 included:
-  - IGListKitExamples
-  - IGListKitMessageExample
-  - IGListKitTodayExample
+  - Examples
+  - Source/IGListSwiftKit
 
 excluded:
   - Pods
@@ -18,7 +17,6 @@ disabled_rules:
   - force_unwrapping
   - comma
   - line_length
-  - force_cast
 
 force_cast: warning
 force_try: warning

Dangerfile

@@ -38,5 +38,5 @@ if (added_source_files || deleted_source_files) && (ios_pods_not_updated || maco
 end
 
 swiftlint.verbose = true
-swiftlint.config_file = './Examples/.swiftlint.yml'
+swiftlint.config_file = '.swiftlint.yml'
 swiftlint.lint_files(inline_mode: true)

Gemfile

@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
 gem 'cocoapods', '~> 1.8.0'
-gem 'danger', '~> 5.0'
-gem 'danger-swiftlint', '~> 0.12.1'
+gem 'danger', '~> 9.2.0'
+gem 'danger-swiftlint', git: 'https://github.com/ashfurrow/danger-ruby-swiftlint.git', branch: 'master'
 gem 'slather', '~> 2.7.4'
 gem 'xcpretty', '~> 0.2.8'