feat(ci): add automatic PR labeling by package/app

Add actions/labeler workflow to automatically label PRs based on which
packages and apps are modified, making it easy to filter PRs by area.

Author: ruudandriessen

.github/labeler.yml

@@ -0,0 +1,35 @@
+"pkg:apollo-core":
+  - changed-files:
+      - any-glob-to-any-file: "packages/apollo-core/**"
+
+"pkg:apollo-react":
+  - changed-files:
+      - any-glob-to-any-file: "packages/apollo-react/**"
+
+"pkg:apollo-wind":
+  - changed-files:
+      - any-glob-to-any-file: "packages/apollo-wind/**"
+
+"pkg:ap-chat":
+  - changed-files:
+      - any-glob-to-any-file: "web-packages/ap-chat/**"
+
+"app:apollo-vertex":
+  - changed-files:
+      - any-glob-to-any-file: "apps/apollo-vertex/**"
+
+"app:storybook":
+  - changed-files:
+      - any-glob-to-any-file: "apps/storybook/**"
+
+"app:landing":
+  - changed-files:
+      - any-glob-to-any-file: "apps/landing/**"
+
+"app:react-playground":
+  - changed-files:
+      - any-glob-to-any-file: "apps/react-playground/**"
+
+"ci":
+  - changed-files:
+      - any-glob-to-any-file: ".github/**"

.github/workflows/pr-labeler.yml

@@ -0,0 +1,19 @@
+name: PR Labeler
+
+# zizmor: ignore[dangerous-triggers]
+# No code checkout — labeler only reads changed files via the GitHub API
+on:
+  pull_request_target:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/labeler@8558fd74291d67161a8a78ce36a881fa63b766a9 # v5
+        with:
+          sync-labels: true