Support ImageDigestMirrorSet with hcp command line

[Joshua-Beha]

When using the oc-mirror plugin v2 (v1 is deprecated as of OCP version 4.18), an ImageDigestMirrorSet (IDMS) is created and not an ImageContentSourcePolicy. It would be nice for the HCP command to support using the IDMS natively and not requiring the user to convert it to the deprecated ICSP. See OCP 4.13 release notes for deprecation notice: https://docs.redhat.com/en/documentation/openshift_container_platform/4.13/html/release_notes/ocp-4-13-release-notes#ocp-4-13-icsp_release-notes

[bryan-cox]

Hey @Joshua-Beha - there is support for IDMS in HCP from 4.14 on I believe -

hypershift/hypershift-operator/main.go

Line 276 in b11c804

imageRegistryOverrides, err = globalconfig.GetAllImageRegistryMirrors(ctx, apiReadingClient, mgmtClusterCaps.Has(capabilities.CapabilityIDMS), mgmtClusterCaps.Has(capabilities.CapabilityICSP))

.

AFAIK OCP 4.14 is EOL so there would be no plans to backport this functionality to 4.13.

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