Updating dockerfile

Dockerfile

@@ -2,14 +2,20 @@ FROM nginx:1.15
 
 MAINTAINER Karl Hughes <khughes.me@gmail.com>
 
+ENV DATA_DIR /var/www
+
 ADD start.sh /usr/local/bin/
 
-ONBUILD ADD conf /etc/nginx/conf.d/
+ADD conf /etc/nginx/conf.d/
 
 # Disable daemon mode
 RUN echo "\ndaemon off;" >> /etc/nginx/nginx.conf && \
+    # Backup configs
     cp -a /etc/nginx/conf.d /etc/nginx/.conf.d.orig && \
-    rm -f /etc/nginx/conf.d/default.conf
+    rm -f /etc/nginx/conf.d/default.conf && \
+    # Make sure the data directory is created and ownership correct
+    mkdir -p $DATA_DIR && \
+    chown -R www-data:www-data $DATA_DIR
 
 WORKDIR /etc/nginx