replace labeler action with periodic-labeler

this replaces the default labeler as it
does not label PRs from forks properly.

with periodic-labeler it should apply labels on
a cron to any PR and resolve the below bug:

https://github.com/spf13/cobra/issues/1092

.github/workflows/label.yml

@@ -1,19 +0,0 @@
-# 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]
-
-jobs:
-  label:
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/labeler@v2
-      with:
-        repo-token: "${{ secrets.GITHUB_TOKEN }}"

.github/workflows/periodic-labeler.yml

@@ -0,0 +1,14 @@
+---
+name: Pull request labeler
+on:
+  schedule:
+    - cron: '*/5 * * * *'
+jobs:
+  labeler:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: paulfantom/periodic-labeler@v0.0.2
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_REPOSITORY: ${{ github.repository }}
+          LABEL_MAPPINGS_FILE: .github/labeler.yml