chore: make all file headers consistent

[alexandear]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Fixes copyright headers for Go files and make it consistent. Integrates goheader linter to automatically check the file header.

Special notes for your reviewer:

Changes:

• Add missing file headers.
• Remove year.
• Fix typos.

About goheader linter: https://golangci-lint.run/usage/linters/#goheader

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

Hi @alexandear. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[mbobrovskyi]

/ok-to-test

[mbobrovskyi]

/lgtm
Thanks!

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 8933e7facf8c998350ad3374258590a1f0e36e80

[mbobrovskyi]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 1138571cdaf87a97628b6739a8f43f593b9d98a6

[mbobrovskyi]

/retest

Due to #4113.

[PBundyra]

Thanks for the PR! Could we make goheader part of make verify?

[alexandear]

Thanks for the PR! Could we make goheader part of make verify?

It's already part of make verify. The verify target executes the targets gomod-verify ci-lint fmt-verify shell-lint toc-verify manifests generate update-helm prepare-release-branch. The ci-lint target runs golangci-lint, which includes the goheader linter.

Or maybe you mean adding a new goheader-verify target that installs denis-tingaikin/go-header and then runs goheader separately from golangci-lint?

[PBundyra]

/lgtm
cc @tenzen-y

It's already part of make verify. The verify target executes the targets gomod-verify ci-lint fmt-verify shell-lint toc-verify manifests generate update-helm prepare-release-branch. The ci-lint target runs golangci-lint, which includes the goheader linter.

Great! Thanks for clarifying

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: da65afcd73f5b114065e5c9486a8b689e27d5c3c

[tenzen-y]

Thank you!
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alexandear, tenzen-y

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