Systemd Service as USER start at Boot

myuser.service

[Unit]
Description=Service Description
After=network.target

[Service]
Type=simple

ExecStartPre=/bin/sleep <TIME-IN-SECONDS>

User=<USER>
Group=<GROUP>

Restart=always

# Compose up
ExecStart=/usr/bin/podman-compose -f /opt/npm/docker-compose.yml up

# Compose down, remove containers and volumes
ExecStop=/usr/bin/podman-compose -f /opt/npm/docker-compose.yml down -v

[Install]
WantedBy=default.target

Above script should help start a user service at system boot

##Make Sure service has WantedBy=default.target otherwise it wont start at the boot

This service located at :

$ /etc/systemd/system/myuser.service

Reload Systemctl Deamon

$ sudo systemctl daemon-reload

Enable login linger for that user:

$ sudo loginctl enable-linger <USER>

Start the Service

$ sudo systemctl start myapp.service

Enable the Service

$ sudo systemctl enable myapp.service

Reboot and wait for a while to start the service, then check; Should work.