docker-plex/root/etc/services.d/plex/run

#!/usr/bin/with-contenv bash

echo "Starting Plex Media Server."
export PLEX_MEDIA_SERVER_INFO_MODEL=$(uname -m)
export PLEX_MEDIA_SERVER_INFO_PLATFORM_VERSION=$(uname -r)
exec \
    s6-setuidgid abc \
    /usr/lib/plexmediaserver/Plex\ Media\ Server