Integrate KIND into makefile

[ccremer]

• Integrates KIND into makefile, just run make run_kind and it will
  • Install the CRDs
  • Run the Operator with this kubeconfig
• Makes the CRD compatible with K8s v1.18 again (the CRD generated was invalid):

The CustomResourceDefinition "prebackuppods.backup.appuio.ch" is invalid: 
* spec.validation.openAPIV3Schema.properties[spec].properties[pod].properties[spec].properties[initContainers].items.properties[ports].items.properties[protocol].default: Required value: this property is in x-kubernetes-list-map-keys, so it must have a default or be a required property
* spec.validation.openAPIV3Schema.properties[spec].properties[pod].properties[spec].properties[containers].items.properties[ports].items.properties[protocol].default: Required value: this property is in x-kubernetes-list-map-keys, so it must have a default or be a required property
make: *** [Makefile:163: setup_e2e_test] Error 1

[tobru]

hack/fix-crd.go might need some explanation what it does and why it is needed, either with a comment, better filename or hint in the README. I'm also not sure if the file is not well formatted?

[ccremer]

hack/fix-crd.go might need some explanation what it does and why it is needed, either with a comment, better filename or hint in the README. I'm also not sure if the file is not well formatted?

I left comments in the Makefile as for the reasons...
But yes, it's not properly formatted. go fmt ./... doesnt catch this file, since there's the // +build fix-crd and that excludes it from fmt ./..., unless I do go fmt hack/fix-crd.go

[tobru]

I left comments in the Makefile as for the reasons...

Yes, but I'd rather want to see these comments in the go file to not have them disconnected. When I see such a file in a repo I would have no idea where to look for a description what it does, also with such an non-descriptive filename.

[ccremer]

I renamed the file and moved the comment