Question about removing docker.userEmulation

[mirpedrol]

Hello!

The option docker.userEmulation has been removed with #4596, but in nf-core we found some situations where we used this option to fix permission errors.

For example, in modules where inside containers the user is biodocker. This causes an error where .command.trace can't be created. See https://github.com/nf-core/modules/blob/master/tests/modules/nf-core/ncbitools/vecscreen/nextflow.config#L11-L16

Is there a different solution for these situations?