[feature] add binary function to install systemd file

[clemenko]

Is your feature request related to a problem? Please describe.
Add a hauler install function to install a systemd unit file for serving registry and fileserver. This is to be used for POC situations where standing up an enterprise reg is not necessary. I am looking to leverage hauler to replace skopeo/docker reg/nfs for serving out a bootstrap.

aka

cat << EOF > /etc/systemd/system/[email protected]
# /etc/systemd/system/hauler.service
[Unit]
Description=Hauler Serve %I Service

[Service]
Environment="HOME=/opt/hauler/"
ExecStart=/usr/local/bin/hauler store serve %i -s /opt/hauler/store
WorkingDirectory=/opt/hauler

[Install]
WantedBy=multi-user.target
EOF

Describe the solution you'd like
hauler install ?

Describe alternatives you've considered
Looking to bundle

Additional context
cute puppy