Merge pull request #985 from buzztaiki/safe_directory

Fix git unsafe repository error on ci test

.github/workflows/ruby.yml

@@ -36,6 +36,8 @@ jobs:
       image: rubylang/ruby:${{ matrix.container_tag }}
     steps:
     - uses: actions/checkout@v3
+    - name: Set working directory as safe
+      run: /usr/bin/git config --global --add safe.directory $(pwd)
     - name: Install dependencies
       run: |
         apt-get update