Use node 6

Dockerfile

@@ -4,7 +4,7 @@ MAINTAINER Johannes Zellner <johannes@cloudron.io>
 RUN mkdir -p /app/code
 WORKDIR /app/code
 
-ENV PATH /usr/local/node-4.7.3/bin:$PATH
+ENV PATH /usr/local/node-6.9.5/bin:$PATH
 
 RUN curl -L https://github.com/NodeBB/NodeBB/archive/v1.4.3.tar.gz | tar -xz --strip-components 1 -f -
 ADD config.json.template /app/code
@@ -12,11 +12,12 @@ RUN npm install --production
 RUN npm install nodebb-plugin-emailer-local
 
 RUN mv /app/code/node_modules /app/code/node_modules_copy && ln -s /run/nodebb/node_modules /app/code/node_modules && \
-	mv /app/code/public /app/code/public_template && ln -sf /run/nodebb/public /app/code/public && \
+	mv /app/code/public /app/code/public_template && ln -s /run/nodebb/public /app/code/public && \
 	rm -rf /app/code/logs && ln -sf /run/nodebb/logs /app/code/logs && \
-	ln -sF /run/nodebb/config.json /app/code/config.json && \
+	ln -s /run/nodebb/config.json /app/code/config.json && \
+	ln -s /run/nodebb/build /app/code/build && \
 	# required for npm install to work at runtime (for nodebb plugins)
-	rm -rf /home/cloudron/.npm && ln -sf /run/nodebb/npm /home/cloudron/.npm
+	rm -rf /home/cloudron/.npm && ln -s /run/nodebb/npm /home/cloudron/.npm
 
 ADD start.sh /app/code/start.sh