Base cluster-update.sh to define needed link_multus_into_k3s #2669

Job	Run time
packages (arm64-secure, arm64)	2m 1s
packages (ubuntu-20.04, amd64)	1m 43s
packages (ubuntu-latest, riscv64)	1m 51s
manifest	1m 9s
eve (arm64, kvm)	33m 26s
eve (arm64, xen)	33m 13s
eve (amd64, kvm)	27m 22s
eve (amd64, xen)	32m 6s
eve (riscv64, mini)	2m 22s
trigger_assets	0s
	2h 15m 13s

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