Add PR labeler action

.github/workflows/labeler.yml

@@ -0,0 +1,23 @@
+name: "Pull Request Labeler"
+
+on:
+  pull_request:
+    branches:
+      - main
+
+permissions:
+  contents: read
+  pull-requests: write
+
+concurrency:
+  group: ${{github.workflow}}-${{github.ref}}
+  cancel-in-progress: true
+
+jobs:
+  labeler:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/labeler@v5
+        with:
+          configuration-path: config/labeler.yml
+          sync-labels: true

config/labeler.yml

@@ -0,0 +1,16 @@
+ci:
+  - changed-files:
+    - any-glob-to-any-file: .github/**
+
+documentation:
+  - changed-files:
+    - any-glob-to-any-file:
+      - docs/**
+      - CHANGELOG.md
+      - LICENSE.txt
+      - README.adoc
+
+java:
+  - changed-files:
+    - any-glob-to-any-file:
+      - src/**/java/**/*.java