ci: fix submodule checkout ownership

Author: Darryl233

.github/workflows/unit_tests_common.yml

@@ -53,14 +53,21 @@ jobs:
         shell: bash
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: ${{ github.event.pull_request.head.repo.full_name || github.repository }}
           ref: ${{ github.event.pull_request.head.ref || github.ref }}
-          submodules: recursive
+          submodules: false
           persist-credentials: false
           set-safe-directory: true
 
+      - name: Checkout submodules
+        run: |
+          git config --global --add safe.directory "$GITHUB_WORKSPACE/third-party/googletest"
+          git config --global --add safe.directory "$GITHUB_WORKSPACE/third-party/json"
+          git submodule sync --recursive
+          git submodule update --init --force --recursive
+
       - name: Run unit-test suite
         env:
           FLAGCX_CI_SET_ENV: ${{ inputs.set_env }}