feat(github-actions): create a github action to automatically apply and remove breaking changes label

.github/workflows/breaking-changes.yml

@@ -0,0 +1,14 @@
+name: DevInfra
+
+on:
+  pull_request_target:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  breaking_changes_label:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./github-actions/breaking-changes-auto-labeling
+        with:
+          angular-robot-key: ${{ secrets.ANGULAR_ROBOT_PRIVATE_KEY }}

.prettierignore

@@ -1,2 +1,3 @@
 github-actions/feature-request/bundle.js
 github-actions/lock-closed/bundle.js
+github-actions/breaking-changes-label/bundle.js

github-actions/BUILD.bazel

@@ -0,0 +1,15 @@
+load("//tools:defaults.bzl", "ts_library")
+
+package(default_visibility = ["//github-actions:__subpackages__"])
+
+ts_library(
+    name = "utils",
+    srcs = [
+        "utils.ts",
+    ],
+    deps = [
+        "@npm//@actions/core",
+        "@npm//@types/node",
+        "@npm//github-app-installation-token",
+    ],
+)

github-actions/breaking-changes-label/BUILD.bazel

@@ -0,0 +1,27 @@
+load("//tools:defaults.bzl", "esbuild_checked_in", "ts_library")
+
+package(default_visibility = ["//github-actions/feature-request:__subpackages__"])
+
+ts_library(
+    name = "breakings-changes-auto-labeling",
+    srcs = glob(
+        ["*.ts"],
+        exclude = ["*.spec.ts"],
+    ),
+    deps = [
+        "//github-actions:utils",
+        "//ng-dev/commit-message",
+        "@npm//@actions/core",
+        "@npm//@actions/github",
+        "@npm//@octokit/rest",
+        "@npm//@types/node",
+    ],
+)
+
+esbuild_checked_in(
+    name = "bundle",
+    entry_point = "main.ts",
+    deps = [
+        ":breakings-changes-auto-labeling",
+    ],
+)

github-actions/breaking-changes-label/action.yml

@@ -0,0 +1,10 @@
+name: 'Breaking Changes Labeling'
+description: 'Automatically label pull requests with a breaking change with a breaking change label'
+author: 'Angular'
+inputs:
+  angular-robot-key:
+    description: 'The private key for the Angular Robot Github app.'
+    required: true
+runs:
+  using: 'node12'
+  main: 'bundle.js'