[node] consider a graceful failure in case of npm package snafu

[fool]

It seems like at present if something went wrong during npm install, the site would be broken until we reverted/cleaned up the problem (since it tears down the old install before starting the now-broken one and thus it fails in a broken state).

We should make this more resilient / smarter (e.g. work in a copy of the image to ensure it builds and then swap the copy in?)

[ionous]

maybe something like this might work to wait and check for node to have written its startup message https://www.marksayson.com/blog/wait-until-docker-containers-initialized/