Getting Cypress to wait for the server to start

cypress.Dockerfile

FROM cypress/included:3.3.0

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

ENV DOCKERIZE_VERSION v0.6.1
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

RUN npm install cypress-image-snapshot@3.0.2

docker-compose.yml

...
  cypress:
    build:
      context: .
      dockerfile: cypress.Dockerfile
    depends_on:
      - frontend
      - mailcatcher
    environment:
      - CYPRESS_baseUrl=http://frontend:3030
    entrypoint: >
      /bin/sh -c '
        which cypress
        dockerize -wait tcp://frontend:3030 -timeout 300s
        cypress run
      '
    working_dir: /apps/sut
    volumes:
      - ../../sut:/apps/sut
    networks:
      - default