[Docs] Add tip to enable vmtoolsd systemd-unit

[jmeza-xyz]

Had a client who used elemental with VSphere and thought the open-vm-tools package was removed from Channel 6.0. Little investigation finds the systemd-unit is enabled but not started. This tip in the docs adds a cloud-config example to enable it at the seedimage level.

apiVersion: elemental.cattle.io/v1beta1
kind: SeedImage
metadata:
  name: fire-img
  namespace: fleet-default
spec:
  baseImage: registry.suse.com/suse/sl-micro/6.0/baremetal-os-container:2.1.1-3.29
  cloud-config:
    write_files:
      - content: |
          name: "Enable vmtoolsd.service"
          stages:
            after-install-chroot:
            - commands:
              - systemctl enable vmtoolsd.service
        path: /etc/elemental/config.d/install-hook.yaml
  registrationRef:
    apiVersion: elemental.cattle.io/v1beta1
    kind: MachineRegistration
    name: fire-nodes
    namespace: fleet-default

GH Issue ref - rancher/elemental-channels#62

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[frelon]

Nice work!