fix rsync IP address detection for v1.33

[BenTheElder]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Fixes detecting the container's IP address when building.

See: #135575

Which issue(s) this PR is related to:

Special notes for your reviewer:

This is NOT a cherry-pick / backport, as due to #112862 1.35+ / master do not use rsync at all anymore. Rather than backporting that larger change, we are just fixing the issue with rsync.

Does this PR introduce a user-facing change?

make / build: fix docker IP address detection

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

x-ref #135576

[k8s-ci-robot]

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[BenTheElder]

/sig release testing

[pohly]

This fixes (from the issue):

 template parsing error: template: :1:19: executing "" at <.NetworkSettings.IPAddress>: map has no entry for key "IPAddress"

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Details

Git tree hash: 39df8889054ad3a90ae20366403b190e2e11927d

[pohly]

/cc kubernetes/release-managers

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder, pohly, saschagrunert

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