Use labeler bot to automatically label PRs (#323)

.github/labeler.yml

@@ -0,0 +1,21 @@
+# TorchGeo modules
+datamodules:
+- torchgeo/datamodules/**
+datasets:
+- torchgeo/datasets/**
+losses:
+- torchgeo/losses/**
+models:
+- torchgeo/models/**
+samplers:
+- torchgeo/samplers/**
+trainers:
+- torchgeo/trainers/**
+transforms:
+- torchgeo/transforms/**
+
+# Other
+documentation:
+- docs/**
+testing:
+- tests/**

.github/workflows/labeler.yml

@@ -0,0 +1,12 @@
+name: "Pull Request Labeler"
+on:
+- pull_request_target
+
+jobs:
+  triage:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/labeler@v3
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"
+        sync-labels: true