Issue description

There are several errors for quadlets:

A)
For rootless containers, since multi-user.target is not defined in the user mode in systemd (you can verify this by running the command systemctl --user status multi-user.target. It is only defined in the system mode systemctl status multi-user.target without --user). That is:
system → use multi-user.target
rootless/user → use default.target

B)
/run/containers/systemd/ and $XDG_RUNTIME_DIR/containers/systemd/ are the path where the auto generated {}.service{} is created.
The correct path for {}.container{} is instead:

• ~/.config/containers/systemd (must be created first)
• /etc/containers/systemd

C)
With the auto-generated .service you can
use systemctl start|stop|status .service
but NOT systemctl enable .service , it will return "failed to enable unit: unit /run/user/1000/systemd/generator/example.service is transient or generated"; but doesn’t matter, since you already set WantedBy