Add node test github workflow

[mzgoddard]

Run npm test on github actions on windows.

[mzgoddard]

@jugglinmike I was trying to debug why the rejects invalid "pressKey" Command test was failing with a mismatch on message: 'Invalid key code specified.'. I realized the main branch is also failing.

[mzgoddard]

The current failure in the workflow is in npm ci. The postinstall script is failing since MakeVoice doesn't exist in the CI environment.

Hmm.

[jugglinmike]

The current failure in the workflow is in npm ci. The postinstall script is failing since MakeVoice doesn't exist in the CI environment.

Hmm.

We can still execute the tests even if the npm ci step fails for that reason. How about applying the continue-on-error feature to that step for now? Doing so will make it slightly harder to identify failures that result from a problem with installing packages, but compared to the risks of continuing to develop this project without any CI at all, I think that's acceptable.

[mzgoddard]

@jugglinmike I rebased onto main and added continue-on-error to npm ci step. I guess the next step would be to run prettier in a different PR or this one. (Or merge this and do that as a follow up.)