Remove nonexistent load flag from docker build commands

[jaehnri]

What this PR does / why we need it:

A nonexistent --load flag is currently being added to docker build commands in the main Makefile for the Darwin kernel. This PR moves this flag from docker build to docker buildx build, where the flag is in fact valid.

We need to fix this issue because it causes essential commands like make dev-env and make image fail for macOS users.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• CVE Report (Scanner found CVE and adding report)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

Which issue/s this PR fixes

fixes #8879

How Has This Been Tested?

I am currently facing this issue.

$ system:
2,3 GHz Intel Core i9 8-Core
macOS Monterey 12.6

$ uname -m
x86_64

$ uname -s
Darwin

$ docker --version
Docker version 20.10.17, build 100c701

$ go version
go version go1.19 darwin/amd64

$ kind version
kind v0.15.0 go1.19 darwin/amd64

make dev-env is working after this change:

$ make dev-env
...
MAC_OS=Darwin
GOARCH=amd64
...
Kubernetes cluster ready and ingress-nginx listening in localhost using ports 80 and 443

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added unit and/or e2e tests to cover my changes.
• All new and existing tests passed.
• Added Release Notes.

Does my pull request need a release note?

Any user-visible or operator-visible change qualifies for a release note. This could be a:

• CLI change
• API change
• UI change
• configuration schema change
• behavioral change
• change in non-functional attributes such as efficiency or availability, availability of a new platform
• a warning about a deprecation
• fix of a previous Known Issue
• fix of a vulnerability (CVE)

No release notes are required for changes to the following:

• Tests
• Build infrastructure
• Fixes for unreleased bugs

For more tips on writing good release notes, check out the Release Notes Handbook

NONE

[k8s-ci-robot]

@jaehnri: This issue is currently awaiting triage.

If Ingress contributors determines this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

The triage/accepted label can be added by org members by writing /triage accepted in a comment.

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.

[k8s-ci-robot]

Hi @jaehnri. Thanks for your PR.

I'm waiting for a kubernetes 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

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.

[longwuyuan]

Related issue #8879

[rikatz]

/lgtm
/approve
@strongjz for final validation!
/hold

[strongjz]

/lgtm
/unhold

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jaehnri, rikatz, strongjz

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [rikatz,strongjz]

Approvers can indicate their approval by writing /approve in a comment
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