Dockerfile

FROM ruby:2.6.5

ENV LANG C.UTF-8

RUN apt-get update -qq \
    && apt-get install -y --no-install-recommends \
    nodejs \
    libpq-dev \
    && apt clean \
    && rm -rf /var/lib/apt/lists/*

ENV ENTRYKIT_VERSION 0.4.0

RUN wget https://github.com/progrium/entrykit/releases/download/v${ENTRYKIT_VERSION}/entrykit_${ENTRYKIT_VERSION}_Linux_x86_64.tgz \
    && tar -xvzf entrykit_${ENTRYKIT_VERSION}_Linux_x86_64.tgz \
    && rm entrykit_${ENTRYKIT_VERSION}_Linux_x86_64.tgz \
    && mv entrykit /bin/entrykit \
    && chmod +x /bin/entrykit \
    && entrykit --symlink

RUN mkdir /app

WORKDIR /app

RUN bundle config build.nokogiri --use-system-libraries

ENTRYPOINT [ \
    "prehook", "ruby -v", "--", \
    "prehook", "bundle install -j3 --quiet", "--"]