Bring up to recent v2 changes around s6

docker/rootfs/etc/s6-overlay/s6-rc.d/backend/run

@@ -5,18 +5,22 @@ set -e
 
 . /bin/common.sh
 
+if [ "$(is_true "$DEBUG")" = '1' ]; then
+	set -x
+fi
+
 log_info 'Starting backend ...'
 
-if [ "$DEVELOPMENT" == "true" ]; then
-	HOME=/tmp/npmuserhome
+if [ "$(is_true "$DEVELOPMENT")" = '1' ]; then
+	HOME=$NPMHOME
 	GOPATH="$HOME/go"
 	mkdir -p "$GOPATH"
-	chown -R npmuser:npmuser "$GOPATH"
+	chown -R "$PUID:$PGID" "$GOPATH"
 	export HOME GOPATH
 	rm -rf /app/backend/.task
 	cd /app/backend || exit 1
-	exec s6-setuidgid npmuser task -w
+	exec s6-setuidgid "$PUID:$PGID" task -w
 else
 	cd /app/bin || exit 1
-	exec s6-setuidgid npmuser /app/bin/server
+	exec s6-setuidgid "$PUID:$PGID" /app/bin/server
 fi