do not require go for building

[ElvinEfendi]

What this PR does / why we need it:

Rel #5216

Given USE_DOCKER is true by default in the Makefile we should not require Go by default on the host machine.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Which issue/s this PR fixes

How Has This Been Tested?

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added tests to cover my changes.
• All new and existing tests passed.

[aledbf]

This will fail. Please check https://github.com/kubernetes/ingress-nginx/blob/master/Makefile#L62
(commands before the tasks)

[ElvinEfendi]

@aledbf that's fine, the caller can set ARCH to avoid it.

[aledbf]

that's fine, the caller can set ARCH to avoid it.

Agree. That said, sorry but no. The change in this PR should include a change throw an error in that case. I added the validation because of a complaint about errors building for arm, without go installed (the image was generated for amd64)

[ElvinEfendi]

@aledbf I pushed a change for that.

[aledbf]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, ElvinEfendi

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