fix: use periodic-labeler instead of labeler

The starter labeler action tries to run on the forked repository instead of the origin repository - which errors due to lack of permissions (good). See https://github.com/actions/labeler/issues/12

Switched to periodic-labeler as it runs on origin as intended.

.github/workflows/label.yml

@@ -1,19 +1,13 @@
-# 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
-
-name: Labeler
-on: [pull_request]
-
+name: Pull Request Labeler
+on:
+  schedule:
+    - cron: '0 0 * * *'
 jobs:
-  label:
-
+  labeler:
     runs-on: ubuntu-latest
-
     steps:
-    - uses: actions/labeler@v2
-      with:
-        repo-token: "${{ secrets.GITHUB_TOKEN }}"
+      - uses: paulfantom/periodic-labeler@master
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_REPOSITORY: ${{ github.repository }}
+          LABEL_MAPPINGS_FILE: .github/labeler.yml