Refactor: Migrate Danger to Kotlin and update GitHub Actions

.github/.java-version

@@ -0,0 +1 @@
+23

.github/workflows/danger_checks.yml

@@ -1,5 +1,11 @@
 name: Danger Checks
 
+# This will cancel any in progress workflows for the same PR, if
+# multiple pushes happen in quick succession.
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 on:
   pull_request_target:
     types: [ opened, synchronize, reopened ]
@@ -17,26 +23,13 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: 'zulu'
-          java-version: 17
+          java-version-file: .github/.java-version
 
       - name: Setup Gradle
-        uses: gradle/gradle-build-action@v2
-
-      - name: Set Up Ruby
-        uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: 3.0
+        uses: gradle/gradle-build-action@v3
 
       - name: Danger Checks
-        run: |
-          gem install bundler
-          bundle install
-          bundle exec danger
-          TOKEN='7469b4e94ce21b43e3ab7a'
-          TOKEN+='79960c12a1e067f2ec'
-          SECRET_TOKEN="${DANGER_GITHUB_API_TOKEN:-$GITHUB_TOKEN}"
-          DANGER_GITHUB_API_TOKEN=${SECRET_TOKEN:-$TOKEN} RUNNING_IN_ACTIONS=true npm run ci:danger || echo "Skipping Danger for External Contributor"
-
+        uses: danger/kotlin@1.3.2
         env:
           DANGER_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

Dangerfile.df.kts

@@ -0,0 +1,30 @@
+@file:Suppress("MagicNumber", "WildcardImport", "ForbiddenComment")
+
+// Editing this file: https://github.com/danger/kotlin?tab=readme-ov-file#autocomplete-and-syntax-highlighting-in-intellij-idea-or-android-studio
+import systems.danger.kotlin.*
+
+danger(args) {
+
+    onGitHub {
+        val additions = pullRequest.additions ?: 0
+        val deletions = pullRequest.deletions ?: 0
+
+        message("Thanks @${pullRequest.user.login}!")
+
+        if (pullRequest.body.isNullOrBlank()) {
+            fail("Please provide a summary in the Pull Request description.")
+        }
+
+        if (additions > 500) {
+            warn("Please consider breaking up this pull request.")
+        }
+
+        if (issue.labels.isEmpty()) {
+            warn("Please add labels to this PR.")
+        }
+
+        if (deletions > additions) {
+            message("🎉 Code Cleanup!")
+        }
+    }
+}