I tried running: -
python3 easy-install.py develop -n frameworkonly

but got the error: -
Traceback (most recent call last):
File "/path/to/frappe_docker/easy-install.py", line 778, in
and args.force_pull
^^^^^^^^^^^^^^^
AttributeError: 'Namespace' object has no attribute 'force_pull'

As per ChatGPT this is a bug which needs to be reported to you guys and its sollution is: -

Ensure force_pull exists for all subcommands

if not hasattr(args, "force_pull"):
    args.force_pull = False