Dockerfile

# Dockerfile
FROM ruby:2.6-alpine

ENV PORT 3000
ENV PATH /node_modules/.bin:$PATH

RUN apk update \
  && apk add \
    nodejs \
    curl \
    npm \
    build-base \
    postgresql-dev \
    tzdata \
  && npm install --global yarn \
  && addgroup --system ifme \
  && adduser \
    -G ifme \
    -h /home/ifme \
    -S \
     ifme \
  && mkdir -p "/app" "/node_modules" \
  && chown ifme:ifme "/app" "/node_modules" \
  # install node modules outside of /app
  && echo "--install.modules-folder /node_modules" > /.yarnrc

WORKDIR /app
USER ifme:ifme

# add gems and npm packages before our code, so Docker can cache them
# see http://ilikestuffblog.com/2014/01/06/
COPY --chown=ifme:ifme Gemfile Gemfile.lock package.json ./
COPY --chown=ifme:ifme client/package.json client/yarn.lock ./client/
RUN bundle install && npm install

COPY --chown=ifme:ifme  . ./
RUN bundle exec rake assets:precompile

CMD ["foreman", "start", "-f", "Procfile.dev"]
EXPOSE ${PORT}