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Looks like we were passing in information for the mirror rewrites wrongly. Instead of above, it should be like this instead:

mirrors := rancher2.ClusterV2RkeConfigRegistriesMirrorArgs{
		Hostname:  pulumi.String("*"),
		Endpoints: pulumi.StringArray{pulumi.String("<https://our-registry>...")},
		Rewrites: pulumi.Map{
			"^(.*)/(.*)":    pulumi.String("rewrite-to-this/$1/$2"),
			"^rancher/(.*)": pulumi.String("rewrite-to-this/rancher/$1"),
		},
	}