fix(devcontainer): configure git to install pre-commit

Author: machikoyasuda

.devcontainer/postAttach.sh

@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 set -eu
 
+git config --global --add safe.directory /home/compiler/site
+
 # initialize hook environments
 pre-commit install --install-hooks --overwrite