scripts: configure docker auth in push-image.sh

[marquiz]

Re-introduce docker authentication that was dropped in
bac6908. Should fix issues with
building multi-arch buildx buildx.

[k8s-ci-robot]

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[marquiz]

/assign @zvonkok

[zvonkok]

/lgtm

[zvonkok]

/override pull-node-feature-discovery-build-image

[k8s-ci-robot]

@zvonkok: zvonkok unauthorized: /override is restricted to Repo administrators.

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/override pull-node-feature-discovery-build-image

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[zvonkok]

/joke

[k8s-ci-robot]

@zvonkok: I had a rough day, and then somebody went and ripped the front and back pages from my dictionary. It just goes from bad to worse.

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[zvonkok]

/meow

[k8s-ci-robot]

@zvonkok:

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/meow

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[marquiz]

/override pull-node-feature-discovery-build-image

[k8s-ci-robot]

@marquiz: Overrode contexts on behalf of marquiz: pull-node-feature-discovery-build-image

In response to this:

/override pull-node-feature-discovery-build-image

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