Fix openapi rendering issue and build tooling improvements

[johanneswuerbach]

Resolves "Failed to build open api spec for root: non-body Restful parameter type should be a simple type, but got : v1.ResourceVersionMatch"

[johanneswuerbach]

/assign @s-urbaniak

[s-urbaniak]

@johanneswuerbach wonderful, thank you! reviewing and also cc'ing @dgrisonnet

[s-urbaniak]

/lgtm

[s-urbaniak]

lgtm, again, thank you so much @johanneswuerbach ! 🚀

[s-urbaniak]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: johanneswuerbach, s-urbaniak

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[s-urbaniak]

@johanneswuerbach do you want to tackle the bump in prometheus-adapter as well? Once done, I can release a 0.8.2 immediately.

[johanneswuerbach]

Yes, working on it now :-)

[s-urbaniak]

@johanneswuerbach fyi: @dgrisonnet found out something is broken with the build though.

[johanneswuerbach]

Let me know if you need any help, here is the k8s-prometheus-adapter PR kubernetes-sigs/prometheus-adapter#335

[dgrisonnet]

The fix seems to be working properly as far as I tested with the test-adapter so I think we can move on with the prometheus-adapter bump.
However, when I was trying to build this project in a freshly cloned repo, the openapi files were not getting generated, which resulted in build errors.