When running npx @guardian/cdk@latest new ... to set up a new project, it gets almost all the way to the end, and then errors when trying to show a list of the new files

Success! Here's a summary of the created files:
/bin/sh: tree: command not found
Error: tree exited with status 127

I've conferred with a second colleague to reproduce the error, and it looks like tree is not a bash utility that is installed by default any more, and we can't rely on its existence. Could we adjust the process to reflect this, either by removing tree as a dependency, or installing it as part of the setup process?