addon registry-alias: change hosts update container image

[tmehlinger]

The most recent Fedora image doesn't include a diff binary. This changes the container image to use Ubuntu Bionic instead, which does provide a diff binary.

Fixes #7715.

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Hi @tmehlinger. Thanks for your PR.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: tmehlinger
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[minikube-bot]

Can one of the admins verify this patch?

[tmehlinger]

Bump for CLA check.

[medyagh]

why ubuntu ? could it be something smaller ?

[tmehlinger]

No reason in particular, that was just my workaround. I've changed it to Alpine 3.11 and fixed the diff command to account for the different between Busybox and GNU.

[RA489]

/ok-to-test

[minikube-pr-bot]

kvm2 Driver
docker Driver

[tstromberg]

Thank you!