Update codex.yml

Author: niechen

.github/workflows/codex.yml

@@ -27,5 +27,6 @@ jobs:
           openai_api_key: ${{ secrets.CODEX_OPENAI_API_KEY }}
           codex_args: --full-auto
           github_token: ${{ secrets.GITHUB_TOKEN }}
+          codex_home: ${{ github.workspace }}/.github/codex/home
         env:
           GEMINI_API_KEY: ${{ secrets.CODEX_GEMINI_API_KEY }}