Declare tomasso(zom) user on maxxi server for graph experiments

teams/staff/onboarding#1

diff origin/production/maxxi.internal.softwareheritage.org current/maxxi.internal.softwareheritage.org
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+ File[/home/zom/.ssh] =>
   parameters =>
     "ensure": "directory",
     "group": "zom",
     "mode": "0600",
     "owner": "zom"
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+ File[/home/zom] =>
   parameters =>
     "ensure": "directory",
     "group": "zom",
     "mode": "0644",
     "owner": "zom"
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+ Ssh_authorized_key[zom tom@swh] =>
   parameters =>
     "ensure": "present",
     "key": "AAAAC3NzaC1lZDI1NTE5AAAAIMG/RXBiwyz3mKwsm9cfGLgDwjkWgMHCRsiLlSrMsnku...
     "type": "ssh-ed25519",
     "user": "zom"
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+ User[zom] =>
   parameters =>
     "comment": "Tommaso Fontana",
     "ensure": "present",
     "shell": "/bin/bash",
     "uid": 3001
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