fix docker file

Dockerfile

@@ -1,11 +1,12 @@
 FROM node:alpine
 RUN mkdir /peer-server
 WORKDIR /peer-server
+COPY bin ./bin
 COPY package.json .
 COPY src ./src
 COPY config ./config
 COPY app.json .
 RUN npm install
 EXPOSE 9000
-ENTRYPOINT ["node", "./src/index.js"]
-CMD [ "--port", "9000" ]
+ENTRYPOINT ["node", "bin/peerjs"]
+CMD [ "--port", "9000", "--path", "/myapp" ]