Update start.sh

start.sh

@@ -7,6 +7,8 @@ service nginx start &> /dev/null
 if [ $? -ne 0 ]; then
     echo "Nginx failed to start"
     echo "Nginx error log:"
+    chown www-data:www-data /var/log/nginx/error.log
+    chmod 644 /var/log/nginx/error.log
     cat /var/log/nginx/error.log
     exit 1
 fi