operator-sdk: Kubebuilder is not listed in prerequisites

Bug Report

Kubebuilder is Tightly coupled in requirements, which is fine but…

1. kubebuilder is not listed in Prerequisites
2. make docker-build ... expects kubebuilder in usr/local/kubebuilder only otherwise it raises an error, which I don’t think is a good idea. User may have kubebuilder anywhere in PATH.

What did you do? make docker-build $IMG

What did you expect to see? resolves kubebuilder from $PATH not from any Specific Location.

What did you see instead? Under which circumstances?

Failure [0.002 seconds]
[BeforeSuite] BeforeSuite 
/home/deepak/projects/go/src/operator/newoperator3/final/crda-operator/controllers/suite_test.go:52

  Unexpected error:
      <*fmt.wrapError | 0xc00046c2a0>: {
          msg: "failed to start the controlplane. retried 5 times: fork/exec /usr/local/kubebuilder/bin/etcd: no such file or directory",
          err: {
              Op: "fork/exec",
              Path: "/usr/local/kubebuilder/bin/etcd",
              Err: 0x2,
          },
      }
      failed to start the controlplane. retried 5 times: fork/exec /usr/local/kubebuilder/bin/etcd: no such file or directory
  occurred

  /home/deepak/projects/go/src/operator/newoperator3/final/crda-operator/controllers/suite_test.go:62
------------------------------


Ran 0 of 0 Specs in 0.002 seconds
FAIL! -- 0 Passed | 0 Failed | 0 Pending | 0 Skipped
--- FAIL: TestAPIs (0.00s)
FAIL
coverage: 0.0% of statements
FAIL    github.com/deepak1725/crda-operator/controllers 0.010s
FAIL
make: *** [Makefile:30: test] Error 1

Environment

• operator-sdk version: 0.19

• go version: 0.14

• Kubernetes version information: 1.18

• Kubernetes cluster kind: minikube

• Are you writing your operator in ansible, helm, or go? go

Possible Solution

Additional context Add any other context about the problem here.