Adding a way to specify a shared image gallery so we can test staging images produced from image-builder before promoting them

[marosset]

Path of kubernetes-sigs/image-builder#1874

[marosset]

/hold
I am going to add a prow job to target the staging gallery and then trigger that on this PR as well

[mboersma]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: marosset, mboersma

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[marosset]

/test ls

[k8s-ci-robot]

@marosset: The specified target(s) for /test were not found.
The following commands are available to trigger optional jobs:

/test pull-e2e-capz-validate-pr-templates

/test pull-e2e-capz-windows-2022-extension

/test pull-e2e-capz-windows-2022-extension-community-eks

/test pull-e2e-capz-windows-2022-extension-community-gke

/test pull-e2e-capz-windows-2022-extension-gmsa

/test pull-e2e-capz-windows-2022-staging-gallery

/test pull-e2e-capz-windows-2025-extension

/test pull-e2e-capz-windows-2025-staging-gallery

/test pull-e2e-run-capz-sh-windows-2022-hyperv

/test pull-kubernetes-e2enode-windows

/test pull-kubernetes-unit-windows

Use /test all to run the following jobs that were automatically triggered:

pull-e2e-capz-windows-2022-extension

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/test ls

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[marosset]

/test pull-e2e-capz-windows-2022-staging-gallery
/test pull-e2e-capz-windows-2025-staging-gallery

[marosset]

/test pull-e2e-capz-windows-2022-staging-gallery
/test pull-e2e-capz-windows-2025-staging-gallery

New gallery images have been published to the staging gallery (previously there were none)

[marosset]

I think we need to scope the *-stagign-gallery jobs to a single region.
I'm seeing

	  "error": {
	    "code": "GalleryImageNotFound",
	    "message": "\"The gallery image /subscriptions/46678f10-4bbb-447e-98e8-d2829589f2d8/resourceGroups/cluster-api-gallery/providers/Microsoft.Compute/galleries/staging_gallery/images/capi-win-2022-containerd/versions/latest is not available in SwitzerlandNorth region. Please contact image owner to replicate to this region, or change your requested region.\"",
	    "target": "imageReference"
	  }

[marosset]

/test pull-e2e-capz-windows-2022-staging-gallery
/test pull-e2e-capz-windows-2025-staging-gallery

[marosset]

/test pull-e2e-capz-windows-2022-staging-gallery
/test pull-e2e-capz-windows-2025-staging-gallery

[marosset]

/hold cancel
the jobs targeting windows images from the staging azure compute gallery are passing!