Add make variant that boots full environment

[dholms]

Summary

Problem

make live does not boot full environment so you don't have access to env variables

Impact

Can't live reload server with env variables while testing locally

Solution

Add a make variant similar to make live that boots full environment

[expede]

I literally just bumped into this as well

[expede]

I'm not sure having a variant even necessarily makes sense. We probably want to load the full actual environment when using this functionality 🤔