Run as root by default

Optionally run as another user/group only if
the env vars are specified. Should give flexibility
to those who need to run processes as root and open ports
without having to request additional priveleges

docker/rootfs/bin/common.sh

@@ -9,6 +9,19 @@ RED='\E[1;31m'
 RESET='\E[0m'
 export CYAN BLUE YELLOW RED RESET
 
+PUID=${PUID:-0}
+PGID=${PGID:-0}
+
+if [[ "$PUID" -ne '0' ]] && [ "$PGID" = '0' ]; then
+	# set group id to same as user id,
+	# the user probably forgot to specify the group id and
+	# it would be rediculous to intentionally use the root group
+	# for a non-root user
+	PGID=$PUID
+fi
+
+export PUID PGID
+
 log_info () {
 	echo -e "${BLUE}❯ ${CYAN}$1${RESET}"
 }