👷 Update GitHub Action labeler to add only one label (fastapi#1304)

Author: tiangolo

.github/labeler.yml

@@ -1,12 +1,18 @@
 docs:
-  - changed-files:
-    - any-glob-to-any-file:
-      - '**/*.md'
+  - all:
+    - changed-files:
+      - all-globs-to-all-files:
+        - '**/*.md'
 
 internal:
-  - changed-files:
-    - any-glob-to-any-file:
-      - .github/**/*
-      - scripts/**/*
-      - .gitignore
-      - .pre-commit-config.yaml
+  - all:
+    - changed-files:
+      - any-glob-to-any-file:
+        - .github/**
+        - scripts/**
+        - .gitignore
+        - .pre-commit-config.yaml
+      - all-globs-to-all-files:
+        - '**/*.md'
+        - 'frontend/**'
+        - 'backend/**'

.github/workflows/labeler.yml

@@ -1,4 +1,4 @@
-name: Pull Request Labeler and Checker
+name: Labels
 on:
   pull_request_target:
     types:
@@ -17,13 +17,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/labeler@v5
+      with:
+        sync-labels: true
   # Run this after labeler applied labels
   check-labels:
     needs:
       - labeler
     permissions:
       pull-requests: read
-    name: Check labels
     runs-on: ubuntu-latest
     steps:
       - uses: docker://agilepathway/pull-request-label-checker:latest