ci: map GH_TOKEN to discover job for gh CLI authentication

Author: haithium

.github/workflows/gather-docs.yml

@@ -11,6 +11,8 @@ jobs:
     runs-on: ubuntu-latest
     outputs:
       repos: ${{ steps.find.outputs.repos }}
+    env:
+      GH_TOKEN: ${{ github.token }}
     steps:
       - name: Find repos
         id: find