devx: Warn when the `values` field incorrectly contain dots

[arcanis]

Is your feature request related to a problem?

I was installing the following chart: https://github.com/bitnami/charts/tree/master/bitnami/rabbitmq/

As you can see, it requires setting a few parameters:

Naturally, that's what I did in my devspace.yaml:

values:
  auth.username: foo
  auth.password: bar

And I spent two evenings trying to figure out why the hell I couldn't connect to the instance, and thinking it was due to some lingering Helm cache somewhere, deleting and recreating everything I could, when the problem simply was that the syntax was incorrect (which I noticed by printing the content of the values.yml file you generate, and comparing with the bitnami defaults).

Which solution do you suggest?

One of those two:

• Either crash if a top-level property in values contain a dot
• Or silently transform it into an object

/kind feature

[FabianKramm]

@arcanis thanks for creating this issue! I agree that can be quite confusing, we could add a warning if something like this is encountered during deploy to notify the user of a potential mistake, but crashing or converting the dots automatically is probably not something we want, as it is possible in the values.yaml of helm itself to define such constructs (although very very rare I agree). Hence it would limit expressibility and if a chart would use such a construct it would be incompatible with DevSpace.