Add workflow to label pull requests (#88)

Author: klane

.github/labeler.yml

@@ -0,0 +1,14 @@
+documentation:
+  - docs/**
+
+examples:
+  - examples/**
+
+github actions:
+  - .github/workflows/*
+
+python:
+  - '**.py'
+
+test:
+  - tests/**

.github/workflows/labeler.yml

@@ -0,0 +1,22 @@
+name: Label pull request
+
+on:
+  - pull_request_target
+
+jobs:
+  label:
+    name: Label pull request
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Generate token
+        id: generate-token
+        uses: tibdex/[email protected]
+        with:
+          app_id: ${{ secrets.APP_ID }}
+          private_key: ${{ secrets.APP_PRIVATE_KEY }}
+
+      - name: Label pull request
+        uses: actions/[email protected]
+        with:
+          repo-token: ${{ steps.generate-token.outputs.token }}