Add University of Dundee cluster config

[dsloanm-uodit]

---

name: New Config
about: A new cluster config

A workaround for nextflow-io/nextflow#2449 is included in the config file. Following the approach at https://github.com/nf-core/configs/blob/9c4830c/conf/hebbe.config#L16-L17

Please follow these steps before submitting your PR:

• If your PR is a work in progress, include [WIP] in its title
• Your PR targets the master branch
• You've included links to relevant issues, if any
• Requested review from @nf-core/maintainers and/or #request-review on slack

Steps for adding a new config profile:

• Add your custom config file to the conf/ directory
• Add your documentation file to the docs/ directory
• Add your custom profile to the nfcore_custom.config file in the top-level directory
• Add your custom profile to the README.md file in the top-level directory
• Add your profile name to the profile: scope in .github/workflows/main.yml

[jfy133]

Theoretically OK, however you've not specified any software environment system which is also quite important (conda, docker, singularity etc.). I see you ask people to use conda to install Nextflow itself, is that the only engine available? If so I would turn that on in the config too

[dsloanm-uodit]

Thanks for the comments - I have explicitly enabled conda in the config. Ideally we would like to use Singularity but our compute nodes aren't quite set up for it yet. It's something we're aiming for, however.

[jfy133]

One last thing to document: I would recommend users specifying a NXF_CONDA_CACHEDIR env variable so they don't create the same conda environments for every run

[dsloanm-uodit]

I've added some notes on NXF_CONDA_CACHEDIR (and fixed a typo in a section header). Thanks again

[jfy133]

Will wait for tests to pass the nwill merge 👍