Introduce {cont_dspath} to contain what {img_dspath} was and fix {img_dspath}#201

Draft

yarikoptic wants to merge 7 commits intodatalad:masterfrom yarikoptic:enh-cont_dspath

+50-28

Commits on Mar 9, 2023

RM: remove trying to provide cont_path to container image config
yarikoptic
committed
TST: Extend test_custom_call_fmt test to test cont_dspath as well
yarikoptic
committed
[release-action] Autogenerate changelog snippet for PR 201
DataLad Bot
committed