Add support for metacache db

[ChillarAnand]

Description of feature

https://github.com/muellan/metacache

Similar to Kraken2, metacache also needs to build a database. Is it possible to add pipeline for this as well?

[jfy133]

It looks pretty straight forward to me (and have come across the tool before!) so happy to do so eventually.

However for the time being I am mirroring database builds for tools that go into into nf-core/taxprofiler , once they are in, I would look into additional tools for here.

If you make an issue to add metacache to nf-core/taxprofiler, it would bump this up the priority list :)

[ChillarAnand]

@jfy133 Thanks for quick reply.

Raised a feature request on nf-core/taxprofiler#506