rancher-node-staging-rke2-metal03: Add configuration

Refs. swh/infra/sysadm-environment#5547

data/hostname/rancher-node-staging-rke2-metal03.internal.staging.swh.network.yaml

+---
+# local cache is not compatible with rancher
+dns::local_cache: false
+dns::nameservers:
+  - 192.168.100.29
+  - 192.168.200.22
+
+icinga2::host::vars:
+  load: high
+
+# override the default values
+mountpoints:
+  /srv/storage/space:
+    ensure: absent
+
+swh::apt_config::enable_non_free: true
+
+zfs::common::zpool_configuration:
+  disk:
+    - nvme-INTEL-SSDPEDMD800G4_CVFT7301000H800MGN
+
+zfs::arc::max_size: 34359738368  # 32 GiB
+
+rancher::rke2::agent::snapshotter: zfs
+