Podman

Generate systemd service

Create a container the normal way

Using this container as a reference, you can generate a systemd service file

podman generate systemd --new --name --files (container)

Remove your old container

podman container rm (container)
cp container-(container).service /etc/systemd/system/
systemctl daemon-reload
systemctl enable --now container-(container)

The container should now be running just as before

Auto-Update container

The command to update containers configured for auto-update is # podman auto-update

Add --label "io.containers.autoupdate=image" to the ExecStart=/usr/bin/podman ... line in the service file you generated
Make sure to use, for example, docker.io/ instead of docker:// as the source of the image

Reload and restart

systemctl daemon-reload
systemctl enable --now container-(container)

If you want to manually run updates for the configured containers, use this command:
# podman auto-update

Auto-Update timer

To truly automate your updates, enable the included timer
# systemctl enable --now podman-auto-update.timer

Check update log

The update logs are kept in the podman-auto-update service
$ journalctl -eu podman-auto-update

Prune images service and timer

/etc/systemd/system/podman-image-prune.service

[Unit]
Description=Podman image-prune service

[Service]
Type=oneshot
ExecStart=/usr/bin/podman image prune -f

[Install]
WantedBy=multi-user.target

/etc/systemd/system/podman-image-prune.timer

[Unit]
Description=Podman image-prune timer

[Timer]
OnCalendar=weekly
Persistent=true

[Install]
WantedBy=timers.target

systemctl daemon-reload
systemctl enable --now podman-image-prune.timer

Documentation