FKAS go.mod is importing an actual CAPM3 release

[mquhuy]

What steps did you take and what happened:
https://github.com/metal3-io/cluster-api-provider-metal3/blob/main/hack/fake-apiserver/go.mod#L7

What did you expect to happen:
Should have used v0.0.0, and added a replace line to refer to ./../../api

Anything else you would like to add:
This happens because our image build workflow uses the absolute context, hence we cannot build with anything outside of the hack/fake-apiserver directory.

This could be solved by mounting the api/ to the build container, but that requires enabling buildkit. We might want to do that anyway, as docker build will go away soon.

/kind bug

[tuminoid]

/triage accepted