Feature request: Support container+conda ad-hoc combination for environment management

[ManavalanG]

Hi, this is a feature request based on slack discussion with @ewels.

Snakemake can natively build conda env within a singularity container. That is, provided a conda environment and singularity container, snakemake would create conda environment using the singularity container and then use singularity+conda env container for the jobs/processes. I would like to request for similar feature in nextflow. While nextflow supports conda or container usage, it doesn't support container+conda setup.

[pditommaso]

Nextflow does the same (and much more) by using Wave containers service

[ManavalanG]

I should have added snakemake does everything locally without having to depend on external services.

I re-read wave docs closely and it does appear to support this feature. I will report back when I get an opportunity to try it out.