Add some CI tests

[natew]

We should start focusing on continuous release as we near beta and bring new members onto the team.

Things I'd like to see:

• Pull requests have a test suite run against them automatically
• Test suite covers some simple things to start:
  • Can run a clean/bootstrap of the repo without errors (report the build errors that do happen if they do). This should catch things like missing package dependencies or type errors we missed.
  • Some basic integration tests, the higher level the better, a couple starting points:
    • Run a full electron build of the production app + then run the production app + puppeteer to run the app itself and check for some javascript that's run that we ensure is inserted last in onInitialize the client app.
    • Some integration tests on a few of the sub-packages: gloss performance regression check, use-store performance regression check.