requirements-check: Review Knative

[johnSchnake]

Review https://knative.dev/docs/install/serving/install-serving-with-yaml/ and related pages to see what can be automated and what gaps remain.

[johnSchnake]

Super important check that isnt often stated must have access to the internet.

Even that is somewhat optional because you can pull from a private repo if configured.

Also had conditional checks (IF one node check XYZ otherwise ABC). So we either just rely on a library of checks and make users spell it out or we allow for abstractions like OR and AND which can be composited.

In the yaml file I imagine that would look something like a prefix notation for math operators:

AND:
   check1...
   check2...
OR:
   checkA...
   checkB...
   checkC...

The only problem is that even though you can imagine the types being somewhat simple:

type AndCheck struct{
 []Check
}

It wouldn't be as simple to serialize/deserialize those checks because they could be of any type of check. It would then effectively be like we just handling arbitrary yaml which will be more complex. Not sure if there are other limitations or if it is just more complex to execute.