use cfgov_setup for building frontend assets

[rosskarchner]

This actually fails right now for unrelated reasons

Done, without errors.
✗ High severity vulnerability found on minimatch@0.2.14
- desc: Regular Expression Denial of Service
- info: https://snyk.io/vuln/npm:minimatch:20160620
- from: regulations-site@0.1.0 > chokidar@0.12.6 > readdirp@1.3.0 > minimatch@0.2.14
Upgrade direct dependency chokidar@0.12.6 to chokidar@1.1.0 (triggers upgrades to readdirp@2.0.1 > minimatch@3.0.2)

Tested 32 dependencies for known vulnerabilities, found 1 vulnerability, 1 vulnerable path.

[rosskarchner]

It's also worth celebrating that the old code probably wouldn't have caught this error, or at least failed later, because call doesn't care whether the command succeeds or fails:

https://github.com/cfpb/regulations-site/pull/817/files#diff-2eeaed663bd0d25b7e608891384b7298L23

[willbarton]

@rosskarchner Hmm, the failure in Travis looks different from that, it seems to be with fsevents.

[rosskarchner]

Either way, it cuts to the problem that started this whole thing: making sure the python build fails if the frontend build fails ;)

[willbarton]

@rosskarchner Looks like this should be fixed!

[rosskarchner]

Trying it now

[rosskarchner]

looks good!