check back to root user for Debian, until problem has been found (#488)

extra/entrypoint.sh

@@ -2,8 +2,8 @@
 
 # set -e Exit the script if an error happens
 set -e
-PUID=${PUID=1000}
-PGID=${PGID=1000}
+PUID=${PUID=0}
+PGID=${PGID=0}
 
 files_ownership () {
     # -h Changes the ownership of an encountered symbolic link and not that of the file or directory pointed to by the symbolic link.