Fixing privileges to mount USB Keys with polkit

After switching to Devuan, I got suddenly dolphin complaining that it cannot mount an USB Key. Since Devuan is back to polkit to get rid of systemd (but polkit is probably part of the problem too), the fix is to add a /etc/polkit-1/localauthority/50-local.d/auto-mount.pkla with:

[Allow Automount]
Identity=unix-group:plugdev
Action=org.freedesktop.udisks2.filesystem-mount
ResultAny=yes
ResultInactive=yes
ResultActive=yes

And make sure users belong to plugdev.

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