image.yaml: disable secure boot

[mike-nguyen]

Secure boot enabled by default causes issues with unsigned kernel
modules.

ref: https://bugzilla.redhat.com/show_bug.cgi?id=2106055

Requires coreos/coreos-assembler#2971

[cgwalters]

/lgtm
as is but (in case you do any followup) I think it'd be good to also put a doc comment above the code in image.yaml linking to the bug.

(git annotate/blame will get one there, but better to save the step for stuff like this)

[mike-nguyen]

Added comment with link to BZ

[travier]

/hold
/lgtm

[travier]

/lgtm
/unhold
We don't have VMware testing here so let's move forward.

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