Merge pull request #28 from Mansehej/docker

Add dockerfile for websocket

Dockerfile

@@ -0,0 +1,9 @@
+FROM node:12-alpine
+
+RUN mkdir -p /home/node/app/node_modules && chown -R node:node /home/node/app
+WORKDIR /home/node/app
+COPY package*.json ./
+USER node
+RUN npm install
+COPY --chown=node:node . .
+CMD [ "npm", "start" ]