Set GH_TOKEN in workflow

Author: lorenyu

.github/workflows/test.yml

@@ -3,6 +3,9 @@ name: Test Platform
 on:
   workflow_dispatch
 
+env:
+  GH_TOKEN: ${{secrets.PLATFORM_TESTER_GITHUB_TOKEN}}
+
 jobs:
   test:
     name: Test Platform

docs/testing.md

@@ -2,7 +2,7 @@
 
 ## Set up tests in GitHub Actions
 
-Set up `GH_TOKEN` as an environment variable secret. The token needs to have
+Set up `PLATFORM_TESTER_GITHUB_TOKEN` as secret. The token needs to have
 `repo:public_repo` and `delete_repo` scopes.
 
 ## Run tests in GitHub Actions