⚠️ Update kubebuilder cli and plugin v3+ to use go version 1.15

[rashmigottipati]

Description

• Update go version from 1.13 to 1.15

Note
Here's the link to update the infra to run the CI jobs as well: kubernetes/test-infra#19527

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[k8s-ci-robot]

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[camilamacedo86]

Hi @rashmigottipati,

Really thank you for your contribution. 🥇 For we are able to move forward with, you need to follow the instructions in #1716 (comment)
/ok-to-test

[camilamacedo86]

/test pull-kubebuilder-e2e-k8s-1-16-2

[camilamacedo86]

Hi @DirectXMan12,

Controller-runtime has updated o use 1.15 already. Have you any objection to this change? Just to confirm.
For me it is OK. We just need also to upgrade the https://github.com/kubernetes/test-infra/blob/master/config/jobs/kubernetes-sigs/kubebuilder/kubebuilder-presubmits.yaml#L13. Could you please push a PR for that and link in the first comment @rashmigottipati?

[camilamacedo86]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: camilamacedo86, rashmigottipati

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• OWNERS [camilamacedo86]

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[camilamacedo86]

/test pull-kubebuilder-e2e-k8s-1-16-2

[rashmigottipati]

I signed it

[rashmigottipati]

@camilamacedo86 thanks for your input Camila. I've created a PR in kubernetes/test-infra updating the go version in https://github.com/kubernetes/test-infra/blob/master/config/jobs/kubernetes-sigs/kubebuilder/kubebuilder-presubmits.yaml#L13 to 1.15.
Here's the link: kubernetes/test-infra#19527

[estroz]

Bumping the v2 plugin to go 1.15 is a breaking change because the binary will fail for previously scaffolded projects (in checkGoVersion()). I recommend only bumping in v3.

[camilamacedo86]

/test pull-kubebuilder-e2e-k8s-1-14-1

/test pull-kubebuilder-e2e-k8s-1-16-2

[estroz]

@rashmigottipati can you add a comment above checkGoVersion() as to why it wasn't updated? (because the kubebuilder binary only cares that the go binary supports modules, which were on by default in go 1.13)

[rashmigottipati]

thanks @estroz, just added a comment as per our discussion.

[estroz]

/lgtm

[estroz]

/retest

[rashmigottipati]

/test pull-kubebuilder-e2e-k8s-1-14-1

/test pull-kubebuilder-e2e-k8s-1-16-2

[estroz]

/retest