ci/prow-entrypoint: Ensure we have a qemu image for followup builds

[cgwalters]

This should fix coreos/coreos-assembler#2919 (comment)

Fixes: c6e7dd9

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[HuijingHei]

/retest

[travier]

Pushed #890 which includes a temporary hack to test the change.

[cgwalters]

/retest

[travier]

Note that nothing here tests this change thus why I did the hack in #890

[openshift-ci]

@cgwalters: all tests passed!

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[travier]

/close
Closing in favor of #891 until we test things more.

[cgwalters]

okay, but wouldn't you say this change is still obviously correct?

[openshift-ci]

@travier: Closed this PR.

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In response to this:

/close
Closing in favor of #891 until we test things more.

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