Make the kubectl toolchain type public

[person142]

Closes #530.

This allows defining your own kubectl toolchains; e.g.

# //:BUILD
toolchain(
    name = "my_kubectl_toolchain",
    target_compatible_with = ...,
    toolchain = "//my/local:kubectl",
    toolchain_type = "@io_bazel_rules_k8s//toolchains/kubectl:toolchain_type",
)

# WORKSPACE
...

load("@io_bazel_rules_k8s//k8s:k8s.bzl", "k8s_repositories")

k8s_repositories()

load("@io_bazel_rules_k8s//k8s:k8s_go_deps.bzl", k8s_go_deps = "deps")

k8s_go_deps()

register_toolchains(
    "//:my_kubectl_toolchain",
)

which then allows more flexibility over what kubectl_configure currently allows.

[k8s-ci-robot]

Hi @person142. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fejta, person142

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[fejta]

/ok-to-test

[person142]

/retest

[fejta]

/retest

[person142]

/retest

[person142]

(Third time is the charm? 🤞)

[person142]

/retest

[k8s-ci-robot]

@person142: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-rules-k8s-e2e	78d7353	link	/test pull-rules-k8s-e2e

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[person142]

Thanks @fejta!