fix(ci): add checks:write permission for unity test runner

The game-ci/unity-test-runner action needs checks:write permission
to create check runs via the checkName parameter.

Signed-off-by: JasonXuDeveloper - 傑 <jason@xgamedev.net>
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: JasonXuDeveloper

.github/workflows/unity-tests.yml

@@ -25,6 +25,7 @@ on:
 
 permissions:
   contents: read
+  checks: write
 
 jobs:
   test: