systemd:
session daemon needs getshed
unconfineduser needs to create $XDG_RUNTIME_DIR/systemd with a type transition
required to systemctl --user disable/enable/daemon-reload

example (this will run whenever you log-in: ~/.config/systemd/user/test.service):

[Unit]
Description=test

[Service]
Type=oneshot
ExecStart=/bin/sh -c "echo $(id -Z)"
RemainAfterExit=yes

[Install]
WantedBy=default.target