change: add namespace opt to tests and use user-provided ingress-class-name

[iwilltry42]

Ref #659

[cjellick]

@iwilltry42 i dont fully understand the need for the test namespace. can you please epxlain?

Also, im going to nitpick your commit message a little. Can you follow these guidelines: https://github.com/acorn-io/acorn/blob/main/CONTRIBUTING.md#commits

Mainly, i want good commit hygiene from us so that we can lead by example for later contributors

[iwilltry42]

Okay, I don't know what the hell happened here, but my rebase to change the wording somehow failed :thinking:

[iwilltry42]

@iwilltry42 i dont fully understand the need for the test namespace. can you please epxlain?

acorn check could be run before acorn install, so the acorn-system namespace doesn't exist yet. So the two options we have are a) create a namespace only for the checks and delete it again or b) let the user provide any existing namespace via that new flag. I'd be happy with both.

[cjellick]

@ibuildthecloud can you please give your thoughts on this one?