Provide a simple way to check the spacegun configuration

[priegger]

Is your feature request related to a problem? Please describe.
In case feature branches and merges are used to update the spacegun configuration, it might be nice to have an automated way to "lint" the new spacegun config before submitting it.

Describe the solution you'd like
A command line switch for one of the spacegun tools (probably standalone) should exist, that makes spacegun read the complete config (either from the filesystem or from a given git branch). The command terminates as soon as possible and the return value indicates, wether the config is ok or not.

Describe alternatives you've considered
It might be possible so start spacegun and parse the (log) output, but this is messy. So there's no real alternative.

Additional context

• This should be usable from CI (e.g. Jenkins).
• It might be nice to have more advanced checks, probably later on: Is the k8s config ok? Do the mentioned config maps and secrets exist?

[dvallin]

Shouldn't be too hard. Have a look at
spacegun/src/config/index.ts