nested spire clusterName too long

[vacan1t]

I am using the spire-nested helmchart and get this error when installing it if I set the clusterName to something longer than 7 characters since prom-cm- is in the template for the port name. I think there is a need to be able to use longer and more describing clusterNames.

Maybe a viable solution would be to use trim here (or maybe there is better place for it:

helm-charts-hardened/charts/spire/charts/spire-server/templates/_controller-manager-container.tpl

Line 92 in 762ba40

name: prom-cm{{ .suffix }}

create Pod spire-external-server-0 in StatefulSet spire-external-server failed error: Pod "spire-external-server-0" is invalid: spec.containers[2].ports[1].name: Invalid value: "prom-cm-makek8ss": must be no more than 15 characters