docker: install less as a build-time dependency in deb-based distros It's needed since 387a76cac28e, otherwise dpkg-checkbuilddeps errors out.

eol: fix 'error' parameter name in the commitctx wrapper Since its introduction in 9dfee83c93c8, the parameter has always been name "error". Yet the eol extension have been using 'haserror' as the argument name, breaking extensions with subclass passing 'error' as a keyword argument.