install: avoid some permissions errors when accesing ~/.conda
install: avoid some permissions errors when accesing ~/.conda

Only partially helps with #2398, see discussion in that thread on
environments.txt file hard coded to user directory.

https://github.com/conda/conda/issues/5388
https://github.com/conda/conda/issues/6748

chapmanb/bcbio-nextgen,vladsaveliev/bcbio-nextgen,a113n/bcbio-nextgen,vladsaveliev/bcbio-nextgen,chapmanb/bcbio-nextgen,lbeltrame/bcbio-nextgen,lbeltrame/bcbio-nextgen,lbeltrame/bcbio-nextgen,vladsaveliev/bcbio-nextgen,a113n/bcbio-nextgen,chapmanb/bcbio-nextgen,a113n/bcbio-nextgen