Add torch lib to path

[alanocallaghan]

This is necessary and sufficient for cuda to be detected for me on windows* and linux**

• Yes I actually tested this on windows 11
  ** I also uninstalled cuda on linux to test this

[alanocallaghan]

The review request is more to make you aware and lodge objections/propose alternatives rather than request you to approve it

[petebankhead]

Thanks do you think we should be checking if these paths exist, and warning if not?

[alanocallaghan]

Yes, I think that's best. In principle somebody could make the script before the conda env, but usually I'd guess it's a transcription error