Install NPM packages & compile webpack

[ekohl]

This only happens if package.json exists.

Opening, but needs test cases. foreman_ansible has package.json, but foreman_expire_hosts doesn't.

[ekohl]

I'm starting to wonder how to properly install NPM for plugins, as well as how to make sure there is caching in place for it.

[evgeni]

testing:

• https://github.com/theforeman/foreman_ansible/pull/672
• https://github.com/theforeman/foreman_expire_hosts/pull/76

[ekohl]

That appears to work. Anything else we should do here? Do you want to apply the same matrix style testing of multiple jobs that we apply in core?

[evgeni]

That's a good question I have no definitive answer for.

I guess it'd be a good idea to run test:$plugin, assets:precompile[$plugin] and db:seed.

For the later we have a separate job, but Leos' is right we should test both paths, all migrations in one go, and foreman first, then plugin. So maybe those three as a matrix and the current separate one kept separate?

[ekohl]

I can't approve since it's my own PR, so let's try this out by me merging it.