Comment 1 for bug 1969976

Yes, I think we could create a new user for fwupd, similar to how it is done in systemd-oomd.postinst (https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/tree/debian/systemd-oomd.postinst?h=ubuntu-jammy) and then use a "User=fwupd" configuration in fwupd-refresh.service.