document build and developer process.

[obnoxxx]

The docs of this project doo not feature a guide how to build and test the plugin locally,

including instructions how to use a locally built plugin with kubectl.

[obnoxxx]

@travisn , @subhamkrai - what do you think? - is this something that should be documented?

[obnoxxx]

I can confirm @BlaineEXE's suggestion from the huddle:

directly invoking bin/kubectl-rook-ceph works. no need to kubectl krew install it

[Javlopez]

Hi, could you add this as part of the developer guide?

Developer changes

We are adding unittests in order to ensure that the destroy-cluster command is working as we expected,
so if you want to expand the functionality, and you need to change the pgk/k8sutil/interface.go remember to recreate the mocks by using make generate

$ make generate
generating mocks...
completed
$

Run test

To run the tests you should to execute make test

$ make test
running unit tests
go test ./...
?   	github.com/rook/kubectl-rook-ceph/cmd	[no test files]
ok  	github.com/rook/kubectl-rook-ceph/cmd/commands	(cached)
ok  	github.com/rook/kubectl-rook-ceph/pkg/crds	(cached)
?   	github.com/rook/kubectl-rook-ceph/pkg/debug	[no test files]
?   	github.com/rook/kubectl-rook-ceph/pkg/dr	[no test files]
?   	github.com/rook/kubectl-rook-ceph/pkg/exec	[no test files]
?   	github.com/rook/kubectl-rook-ceph/pkg/health	[no test files]
?   	github.com/rook/kubectl-rook-ceph/pkg/k8sutil	[no test files]
?   	github.com/rook/kubectl-rook-ceph/pkg/logging	[no test files]
?   	github.com/rook/kubectl-rook-ceph/pkg/rook	[no test files]
ok  	github.com/rook/kubectl-rook-ceph/pkg/mons	(cached)
$

[travisn]

@Javlopez We will want the documentation for the destroy cluster command to be included with #173. Only the sections on the developer guide and running tests need to be in a developer guide for this issue. Thanks!