Implement an npx canary deployment test

**Is your feature request related to a problem? Please describe.**

At Artsy, we run `auto` at its latest version (via npx). We've had issues of failures in this process where `npx` would fail, but other versions wouldn't.

**Describe the solution you'd like**

I'd like to implement a canary test where when a PR creates a canary deployment it automatically tries to publish a test package to npm using `npx` using the canary version.

**Describe alternatives you've considered**

If we decide not to go this route I'll likely setup a process within artsy to treat one of our projects as a canary and only upgrade the version of auto once the deploy is proven to work from there.