CI: Add PR labeler (#13475)

* Add pr labeler

* Triger on docs change

* Make mutually exclusive

* Add requirements

* files

Co-authored-by: Rohit Gupta <rohitgr1998@gmail.com>

Co-authored-by: Jirka Borovec <Borda@users.noreply.github.com>
Co-authored-by: Rohit Gupta <rohitgr1998@gmail.com>

.github/labeler.yml

@@ -0,0 +1,7 @@
+app:
+- any: ['src/lightning*/**/*', 'tests/tests_app*/**/*', 'docs/source-app/**/*', 'requirements/app/*']
+  all: ['!src/pytorch_lightning/**/*', '!tests/tests_pytorch/**/*', '!docs/source-pytorch/**/*', '!requirements/pytorch/*']
+
+pl:
+- any: ['src/pytorch_lightning/**/*', 'tests/tests_pytorch/**/*', 'docs/source-pytorch/**/*', 'requirements/pytorch/*']
+  all: ['!src/lightning*/**/*', '!tests/tests_app*/**/*', '!docs/source-app/**/*', '!requirements/app/*']

.github/workflows/labeler.yml

@@ -0,0 +1,15 @@
+name: Label Pull Requests
+on:
+- pull_request_target
+
+jobs:
+  triage:
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/labeler@v4
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"
+        sync-labels: true