sync before executing next command

Author: zaporylie

master/Dockerfile

@@ -4,9 +4,9 @@ MAINTAINER drupal-docker
 ADD http://files.drush.org/drush.phar /usr/local/bin/drush
 
 RUN apt-get update && apt-get install -y mysql-client \
-  && chmod a+x /usr/local/bin/drush \
-  && /usr/local/bin/drush core-status -y \
+  && chmod a+x /usr/local/bin/drush; sync \
+  && drush core-status -y \
   && drush init -y \
-	&& rm -rf /var/lib/apt/lists/*
+  && rm -rf /var/lib/apt/lists/*
 
 CMD ["drush", "core-cli"]