Run ModemManager from addon and continue

Hi!

If I write in the my custom addon file run.sh:

mmcli -L
echo "Finish"

I get in the log:

error: couldn't find the ModemManager process in the bus
Finish

Ok, I need to start ModemManager. Updated run.sh:

ModemManager &
mmcli -L
echo "Finish"

And the log stops on the information from the starting ModemManager, the remaining code is not executed.

How to run ModemManager as a daemon and to continue execution? The systemctl is also unavailable and I cannot it to install - RUN apk add systemd in Dockerfile causes an error The command '/bin/ash -o pipefail -c apk add systemd' returned a non-zero code: 1