Added ability to rsync the map differences

Dockerfile

@@ -11,7 +11,7 @@ FROM debian:latest
 MAINTAINER Mark Ide Jr (https://www.mide.io)
 
 RUN apt-get update && \
-    apt-get install -y wget gnupg && \
+    apt-get install -y wget gnupg rsync && \
     echo "deb http://overviewer.org/debian ./" >> /etc/apt/sources.list && \
     wget -O - https://overviewer.org/debian/overviewer.gpg.asc | apt-key add - && \
     apt-get update && \

entrypoint.sh

@@ -1,6 +1,8 @@
 #!/bin/bash
 set -o errexit
 
+rsync -ra --delete /home/minecraft-out/ /home/minecraft/render/
+
 # Require MINECRAFT_VERSION environment variable to be set (no default assumed)
 if [ -z "$MINECRAFT_VERSION" ]; then
   echo "Expecting environment variable MINECRAFT_VERSION to be set to non-empty string. Exiting."
@@ -21,3 +23,5 @@ if [ "$POI_ONLY" != "y" ]; then
 fi
 
 overviewer.py --config /home/minecraft/config.py --genpoi $OVERVIEWER_PARAMS
+
+rsync -ra --delete /home/minecraft/render/ /home/minecraft-out