🚸 Just bind data config file instead of whole directory containing data config file

[shnizzedy]

Related problem

Right now, cpac read-only binds the directory containing a user-provided data config file

cpac/src/cpac/backends/platform.py

Lines 214 to 219 in 9be16ca

	dc_dir = os.path.dirname(kwargs['data_config_file'])
	self._bind_volume(dc_dir, dc_dir, 'r')
	locals_from_data_config = Locals_to_bind()
	locals_from_data_config.from_config_file(
	kwargs['data_config_file']
	)

which can cause trouble if the output (or logging or working) directory is a descendant of that directory (see 이지원 /cpax_forum: Re: RuntimeError)

Proposed feature

Just bind the data config file itself, something like

 dc_file = os.path.abspath(kwargs['data_config_file']) 
 self._bind_volume(dc_file, dc_file, 'r') 
 locals_from_data_config = Locals_to_bind() 
 locals_from_data_config.from_config_file( 
     dc_file 
 ) 

Acceptance criteria

• data config file binds read-only but doesn't (necessarily) bind its parent directory read-only

Alternatives

No response

Additional context

Maybe also bind individual files from the data config instead of their parent directories too?