macOS CI builds no longer hang when the module cache loses its private network address

Runner-cache Elastic Metal nodes on Scaleway can silently lose their private network address when the DHCP lease expires without being renewed. This caused macOS CI builds to hang at “Fetching remote binaries via module cache. Hold tight…” with roughly five-minute timeouts per module. The CAPI Scaleway provider now discovers the address once via DHCP and then holds it statically, making the cache NodePort reliably reachable and preventing the outage from recurring on newly provisioned nodes.