Add dangermattic GHA triggering danger Buildkite pipeline

.buildkite/danger.yml

@@ -0,0 +1,21 @@
+# Nodes with values to reuse in the pipeline.
+common_params:
+  # Common plugin settings to use with the `plugins` key.
+  - &ruby_image "public.ecr.aws/docker/library/ruby:3.2.2"
+
+agents:
+  queue: "main"
+
+steps:
+  - label: "☢️ Danger - PR Check"
+    command: .buildkite/commands/danger-pr-check.sh
+    plugins:
+      - docker#v5.8.0:
+          image: *ruby_image
+          propagate-environment: true
+          environment:
+            - "DANGER_GITHUB_API_TOKEN"
+    if: "build.pull_request.id != null"
+    retry:
+      manual:
+        permit_on_passed: true

.buildkite/pipeline.yml

@@ -21,18 +21,16 @@ steps:
   # Wait for Gradle Wrapper to be validated before running any other jobs
   - wait
 
-  - label: "☢️ Danger - PR Check"
-    command: .buildkite/commands/danger-pr-check.sh
-    plugins:
-      - docker#v5.8.0:
-          image: "public.ecr.aws/docker/library/ruby:3.2.2"
-          propagate-environment: true
-          environment:
-            - "DANGER_GITHUB_API_TOKEN"
-    if: "build.pull_request.id != null"
-    retry:
-      manual:
-        permit_on_passed: true
+  - trigger: "danger"
+    label: "☢️ Danger - PR Check"
+    build:
+      message: "${BUILDKITE_MESSAGE}"
+      commit: "${BUILDKITE_COMMIT}"
+      branch: "${BUILDKITE_BRANCH}"
+      env:
+        BUILDKITE_PULL_REQUEST: "${BUILDKITE_PULL_REQUEST}"
+        BUILDKITE_PULL_REQUEST_BASE_BRANCH: "${BUILDKITE_PULL_REQUEST_BASE_BRANCH}"
+        BUILDKITE_PULL_REQUEST_REPO: "${BUILDKITE_PULL_REQUEST_REPO}"
 
   - label: "detekt"
     command: |

.github/workflows/dangermattic.yml

@@ -0,0 +1,12 @@
+on:
+  pull_request:
+    types: [review_requested, review_request_removed, labeled, unlabeled, milestoned, demilestoned]
+
+steps:
+  - name: "☢️ Danger - PR Check"
+    uses: "buildkite/trigger-pipeline-action@v2.0.0"
+    with:
+      buildkite_api_access_token: ${{ secrets.TRIGGER_BK_BUILD_TOKEN }}
+      pipeline: "automattic/woocommerce-android"
+      branch: "${{ github.head_ref }}"
+      build_env_vars: '{"PIPELINE": "danger.yml", "BUILDKITE_PULL_REQUEST": "${{ github.event.issue.number }}", "BUILDKITE_PULL_REQUEST_REPO": "${{ github.repository }}", "BUILDKITE_PULL_REQUEST_BASE_BRANCH": "${{ github.ref }}"}'