docker maintenance

- removing broken sed (was also updating BASE_URL) in favor of NODE_DB_URI (will require documentation)
 - changing build order to reduce rebuilding some things unnecessarily
 - more effectively using WORKDIR to simplify commands

Dockerfile

@@ -3,7 +3,7 @@ FROM ubuntu:trusty
 MAINTAINER Sabe Jones <sabe@habitica.com>
 
 # Avoid ERROR: invoke-rc.d: policy-rc.d denied execution of start.
-RUN echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d
+RUN echo -e '#!/bin/sh\nexit 0' > /usr/sbin/policy-rc.d
 
 # Install prerequisites
 RUN apt-get update
@@ -22,20 +22,19 @@ RUN apt-get install -y nodejs
 RUN apt-get clean
 RUN rm -rf /var/lib/apt/lists/*
 
-# Clone Habitica repo and install dependencies
-RUN git clone https://github.com/HabitRPG/habitrpg.git
+# Install global packages
 RUN npm install -g gulp grunt-cli bower
-RUN cd /habitrpg && npm install
-RUN cd /habitrpg && bower install --allow-root
+
+# Clone Habitica repo and install dependencies
+WORKDIR /habitrpg
+RUN git clone https://github.com/HabitRPG/habitrpg.git /habitrpg
+RUN npm install
+RUN bower install --allow-root
 
 # Create environment config file and build directory
-RUN cd /habitrpg && cp config.json.example config.json
-RUN mkdir -p /habitrpg/website/build
-
-# Point config.json to Mongo instance. Edit the IP address to your running Mongo container's IP before running.
-RUN cd /habitrpg && sed -i 's/localhost/0.0.0.0/g' config.json
+RUN cp config.json.example config.json
+RUN mkdir -p ./website/build
 
 # Start Habitica
 EXPOSE 3000
-WORKDIR /habitrpg/
 CMD ["npm", "start"]