Prevent race conditions with Dockernize

Dockerfile

FROM node:8.7.0
MAINTAINER mlabouardy <[email protected]>

RUN apt-get update && apt-get install -y wget

ENV DOCKERIZE_VERSION v0.5.0
RUN wget https://github.com/jwilder/dockerize/releases/download/$DOCKERIZE_VERSION/dockerize-linux-amd64-$DOCKERIZE_VERSION.tar.gz \
    && tar -C /usr/local/bin -xzvf dockerize-linux-amd64-$DOCKERIZE_VERSION.tar.gz \
    && rm dockerize-linux-amd64-$DOCKERIZE_VERSION.tar.gz

WORKDIR /app

RUN npm install mysql express

COPY server.js .

EXPOSE 3000

CMD dockerize -wait tcp://mysql:3306 -timeout 1m && node server.js