Fix docker build

The scheduled docker build jobs have been broken for a while.

The first issue was hanging on something to do with time zones. I think that this was a package that was needed to build MultiNest but since we conda install that now I could remove that. Some apt-geting is still needed for pypolychord, but less.

After that was resolved it started hanging trying to install lalsuite/gwpy/ligo.skymap/ligo-gracedb due to conflicts, I resolved this by moving some things from conda to pip. I haven't checked that actually produced a valid environment though.

I also moved as many of the samplers as possible to conda install.

I added a new testing requirement parameterized that I need to fix !1043 (merged).

I'll revert the changes to the ci yaml before unmarking as draft.