fixes hook amd presubmit to use proper env var

[jaxesn]

Issue #, if available:

Description of changes:

When I added the arm build I copied the env var from other presubmit jobs. The one we were using is wrong, we changed at one point and never updated these jobs. The actual env var is, FAKE_ARM_BINARIES_FOR_VALIDATION, per https://github.com/aws/eks-anywhere-build-tooling/blob/main/Common.mk#L452. We do not to usually set it because its auto set based on the binary_platforms

The hook build is a bit different because I left the amd build building both binary platforms, because it can, most of the other examples cannot because they are cross compiling use CGO. I left it this way so that checksum updates is a bit easier. So for this presubmit I am going to set the fake explicitly.

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[abhay-krishna]

/lgtm
/approve

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[eks-distro-bot]

@jaxesn: Updated the job-config configmap in namespace default at cluster default using the following files:

• key containerd-presubmits.yaml using file jobs/aws/eks-anywhere-build-tooling/containerd-presubmits.yaml
• key hook-presubmit.yaml using file jobs/aws/eks-anywhere-build-tooling/hook-presubmit.yaml
• key runc-presubmits.yaml using file jobs/aws/eks-anywhere-build-tooling/runc-presubmits.yaml
• key source-controller-presubmits.yaml using file jobs/aws/eks-anywhere-build-tooling/source-controller-presubmits.yaml

In response to this:

Issue #, if available:

Description of changes:

When I added the arm build I copied the env var from other presubmit jobs. The one we were using is wrong, we changed at one point and never updated these jobs. The actual env var is, FAKE_ARM_BINARIES_FOR_VALIDATION, per https://github.com/aws/eks-anywhere-build-tooling/blob/main/Common.mk#L452. We do not to usually set it because its auto set based on the binary_platforms

The hook build is a bit different because I left the amd build building both binary platforms, because it can, most of the other examples cannot because they are cross compiling use CGO. I left it this way so that checksum updates is a bit easier. So for this presubmit I am going to set the fake explicitly.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

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