update build scripts

Dockerfile

@@ -4,6 +4,8 @@ COPY ./ /app
 
 WORKDIR /app
 
+RUN rm -rf node_modules/* && make clean
+
 RUN npm install
 
 
@@ -20,8 +22,7 @@ WORKDIR /app
 # The app will run as the 'app' user, and so not have write permissions
 # on any files it doesn't need.
 RUN useradd --user-group --create-home --home-dir /app --shell /bin/false app
-
-RUN [ -e ./install_deps.sh ] && ./install_deps.sh
+RUN ./install_deps.sh
 ENTRYPOINT ["/bin/sh", "entrypoint.sh"]
 
 CMD ["node","app.js"]