Updates in install scripts

Dockerfile

@@ -0,0 +1,22 @@
+FROM node:10.14-jessie
+
+RUN apt-get update && apt-get install -y pwgen netcat
+
+# First install dependencies
+COPY server/package.json /app/server/package.json
+COPY client/package.json /app/client/package.json
+COPY shared/package.json /app/shared/package.json
+COPY zone-mta/package.json /app/zone-mta/package.json
+
+WORKDIR /app/
+
+RUN for idx in client shared server zone-mta; do (cd $idx && npm install); done
+
+# Later, copy the app files. That improves development speed as buiding the Docker image will not have
+# to download and install all the NPM dependencies every time there's a change in the source code
+COPY . /app
+
+RUN cd client && npm run build
+
+EXPOSE 3000 3003 3004
+ENTRYPOINT ["bash", "/app/docker-entrypoint.sh"]