ci: add configs needed to push gvisor image to k8s-infra using prow

[medyagh]

#22404

still need to add the config on the test-infra side as well

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[Copilot]

Pull request overview

This PR adds the necessary configuration files to push the gvisor image to k8s-infra using Prow, aligning it with the existing kubernetes-bootcamp image workflow.

Key changes:

• Adds new Prow build target and cloudbuild configuration for automated gvisor image building
• Reorganizes gvisor Dockerfile to deploy/image/gvisor/ directory
• Updates Makefile to remove manual push workflow in favor of Prow-based automation

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
hack/update/golang_version/golang_version.go	Updates path reference for gvisor Dockerfile location
hack/prow/prow.mk	Adds new Prow target for building and pushing gvisor images, renames kubernetes-bootcamp target for consistency
hack/prow/image/kubernetes-bootcamp/cloudbuild.yaml	Updates target name to match renamed Makefile target
hack/prow/image/gvisor/cloudbuild.yaml	New cloudbuild configuration for gvisor image builds via Prow
deploy/image/gvisor/Dockerfile	New multi-stage Dockerfile for building gvisor addon
Makefile	Removes GVISOR_TAG variable and manual push target, updates local build target with new Dockerfile path

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[k8s-ci-robot]

@medyagh: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
integration-vfkit-docker-macos-arm	27493c7	link	false	/test integration-vfkit-docker-macos-arm

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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