miniconda: auto source to avoid need for 'conda init'

[HenrikBengtsson]

The module should source:

• "${PREFIX}/etc/profile.d/conda.sh"
• "${PREFIX}/etc/profile.d/conda.csh"

when loaded.

[HenrikBengtsson]

Oh, I've already prepared for this in

https://github.com/HenrikBengtsson/CBI-software/blob/648ab472b125b119bd3046a1467eaa9f939fb9a5/CBI/wip-miniconda3/Makefile#L9-L18

But turns out I only tested locally with Lmod 8.6, and there it works, but with Lmod 8.2.7 (C4 and Wynton) it doesn't work.