Add auto-labelling to pull requests (OSGeo#531)

* GitHub: add auto-labelling to pull requests

* add Markdown; add python/; update action version

* use pull_request_target

* update after review feedback

* use docs label for docs

* update for actions/labeler@v5 with added review suggestions

---------

Co-authored-by: Markus Neteler <[email protected]>
Co-authored-by: Edouard Choinière <[email protected]>

.github/labeler.yml

@@ -0,0 +1,88 @@
+---
+libraries:
+  - changed-files:
+      - any-glob-to-any-file:
+          - lib/**/*
+          - include/grass/*
+          - include/grass/**/*
+          - python/**/*
+module:
+  - changed-files:
+      - any-glob-to-any-file:
+          - db/**/*
+          - display/**/*
+          - general/**/*
+          - imagery/**/*
+          - misc/**/*
+          - ps/**/*
+          - raster/**/*
+          - raster3d/**/*
+          - scripts/**/*
+          - temporal/**/*
+          - vector/**/*
+vector:
+  - changed-files:
+      - any-glob-to-any-file: vector/**/*
+raster:
+  - changed-files:
+      - any-glob-to-any-file: raster/**/*
+temporal:
+  - changed-files:
+      - any-glob-to-any-file: temporal/**/*
+database:
+  - changed-files:
+      - any-glob-to-any-file: db/**/*
+GUI:
+  - changed-files:
+      - any-glob-to-any-file: gui/**/*
+Windows:
+  - changed-files:
+      - any-glob-to-any-file: mswindows/**/*
+macOS:
+  - changed-files:
+      - any-glob-to-any-file: macosx/**/*
+Linux:
+  - changed-files:
+      - any-glob-to-any-file: singularity/**/*
+docker:
+  - changed-files:
+      - any-glob-to-any-file: docker/**/*
+docs:
+  - changed-files:
+      - any-glob-to-any-file:
+          - doc/**/*
+          - man/**/*
+RFC:
+  - changed-files:
+      - any-glob-to-any-file: doc/development/rfc/*
+translation:
+  - changed-files:
+      - any-glob-to-any-file: locale/**/*
+CI:
+  - changed-files:
+      - any-glob-to-any-file:
+          - .github/**/*
+          - .travis/**/*
+
+# based on file types
+Python:
+  - changed-files:
+      - any-glob-to-any-file: '**/*.py'
+C:
+  - changed-files:
+      - any-glob-to-any-file: '**/*.c'
+C++:
+  - changed-files:
+      - any-glob-to-any-file: '**/*.cpp'
+CSS:
+  - changed-files:
+      - any-glob-to-any-file: '**/*.css'
+HTML:
+  - changed-files:
+      - any-glob-to-any-file: '**/*.html'
+JavaScript:
+  - changed-files:
+      - any-glob-to-any-file: '**/*.js'
+Markdown:
+  - changed-files:
+      - any-glob-to-any-file: '**/*.md'

.github/workflows/label.yml

@@ -0,0 +1,25 @@
+---
+name: Pull Request Labeler
+
+# This workflow will triage pull requests and apply a label based on the
+# paths that are modified in the pull request.
+#
+# To use this workflow, you will need to set up a .github/labeler.yml
+# file with configuration.  For more information, see:
+# https://github.com/actions/labeler/blob/master/README.md
+
+on:
+  - pull_request_target
+
+permissions: {}
+
+jobs:
+  labeler:
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/labeler@v5
+        with:
+          sync-labels: true