Enable unique docker container for each process

[schorlton]

Is your feature request related to a problem? Please describe. Currently, a docker container can only be specified for the whole workflow.

Describe the solution you'd like Nextflow easily enables unique containers for each process with the container 'image_name_1' setting at the top of a process. Currently I have not figured out a way to specify this in DolphinNext as the header, body and footer of a process are contained within the quotes, although I am quite possibly missing something.

Describe alternatives you've considered Can make my own docker container containing dependencies for all of the processes, publish and run the full pipeline in that container, although this is less convenient than using premade biocontainers or the like.

[nephantes]

It is in our list. We will add this functionality soon.