[WIP] add conda environment for Perl into snakemake execution

[ctb]

Note, merge into #11.

[ctb]

@abradyIGS would be interested to know if this works for ya. Just try running make.

[abradyIGS]

checking

[abradyIGS]

Building DAG of jobs...
CreateCondaEnvironmentException:
Your conda installation is not configured to use strict channel priorities. This is however crucial for having robust and correct environments (for details, see https://conda-forge.org/docs/user/tipsandtricks.html). Please configure strict priorities by executing 'conda config --set channel_priority strict'.
make: *** [all] Error 1

[ctb]

yes, is ok to run.

[abradyIGS]

make ran okay, make update and subsequent rebuild command propagated successfully to dev website. i think you were updating at the same time and we clobbered each other, but once i was sure that had stopped, it worked fine.

note my base environment already has access to perl -- the conda flow did install the YML for the dependency and i assume it pointed itself to the right place, but i can't swear to it without dumping a bunch of debug logic that would prolly be overkill.

[raynamharris]

I don't have mamba installed so I'm getting this message:

snakemake -j 1 --use-conda
Error: mamba package manager is not available. The mamba package manager (https://github.com/mamba-org/mamba) is an extremely fast and robust conda replacement. It is the recommended way of using Snakemake's conda integration. It can be installed with `conda install -n base -c conda-forge mamba`. If you still prefer to use conda, you can enforce that by setting `--conda-frontend conda`.
make: *** [all] Error 1

[raynamharris]

mamba is not easy to install.... 20 min later still trying...

(content-reg) raynamharris@ip update-content-registry % conda install -n base -c conda-forge mamba
Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: \