Enable Tinycore Functest image multiarch

[Davo911]

What this PR does / why we need it:
Changeup some bazel code to be able to build the tinycore image needed for some functional tests for arm and s390x

Which issue(s) this PR fixes :
Fixes #3627

Release note:

NONE

[kubevirt-bot]

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[Davo911]

cc: @cfilleke

[aburdenthehand]

/cc @akalenyu @awels

[awels]

/test all

[awels]

Just going to run through the tests before approving, looks fine to me.

[awels]

/test pull-cdi-goveralls

[akalenyu]

/approve
/lgtm

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: akalenyu

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