Mounting (read only) first disk of mirror raid of old qnap

I could not startup my old Qnap, but there was a lot of data on disk(1).
My aim was to mount this in my zimaos machine. I needed lvm and this was not available

Right now I installed a temp ubuntu container and could mount it. Below there where a couple of commands.

docker run -it --privileged --net=host -v /dev:/dev -v /mnt:/mnt ubuntu /bin/bash

mdadm --assemble --run --force /dev/md127 /dev/sdc3

vgchange -ay

I managed to mount it, but it is in the container.

It looks a bit clumsy and the disk is not visable in gui (stuck in container). Is there a better way to do this?