Significantly improve the Dockerfile

- Adds dumb-init so closes #403, closes #361, closes #383
- User mode docker so closes #192, closes #65
- Uses latest docker ubuntu instead of 18.10 which is the rolling tag so closes #404

Thanks to @RichardMcSorley and @sr229

Dockerfile

@@ -16,17 +16,30 @@ COPY . .
 RUN yarn && NODE_ENV=production yarn task build:server:binary
 
 # We deploy with ubuntu so that devs have a familiar environment.
-FROM ubuntu:18.10
+FROM ubuntu:18.04
 
 RUN apt-get update && apt-get install -y \
 	openssl \
 	net-tools \
 	git \
 	locales \
+	sudo \
 	dumb-init
+
 RUN locale-gen en_US.UTF-8
 # We unfortunately cannot use update-locale because docker will not use the env variables
 # configured in /etc/default/locale so we need to set it manually.
-ENV LANG=en_US.UTF-8
-ENV LC_ALL=en_US.UTF-8 
-ENTRYPOINT ["/usr/bin/dumb-init", "code-server"]
+ENV LC_ALL=en_US.UTF-8
+
+RUN adduser --gecos '' --disabled-password coder
+RUN echo "coder ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers.d/nopasswd
+
+USER coder
+# We create first instead of just using WORKDIR as when WORKDIR creates, the user is root.
+RUN mkdir -p /home/coder/project
+WORKDIR /home/coder/project
+
+COPY --from=0 /src/packages/server/cli-linux-x64 /usr/local/bin/code-server
+EXPOSE 8443
+
+ENTRYPOINT ["dumb-init", "code-server"]