Pixi integration

[j-atkins]

Pixi workflows can be introduced to VirtualShip.

N.B. there is an PR already for this (#214), which should be opened back up and ported over.

[iuryt]

This is great! I was already kind of creating my own pixi-version virtualship environments, but there is so much more we could do in terms of automation and testing.

[VeckoTheGecko]

Closed by #282