chore(ci): set ldflags for goreleaser from env.

[FedeDP]

What type of PR is this?

/kind bug

Any specific area of the project related to this PR?

/area build

What this PR does / why we need it:

Properly enforce goreleaser flag from env LDFLAGS (passed from make release). This is the same thing we do in Driverkit

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[poiana]

@FedeDP: The label(s) kind/bug, area/build cannot be applied, because the repository doesn't have them.

In response to this:

What type of PR is this?

/kind bug

Any specific area of the project related to this PR?

/area build

What this PR does / why we need it:

Properly enforce goreleaser flag from env LDFLAGS (passed from make release). This is the same thing we do in Driverkit

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[poiana]

There is not a label identifying the kind of this PR.
Please specify it either using /kind <group> or manually from the side menu.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: FedeDP, leogr

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