Dockerfile-rails

FROM ruby:2.7.1-alpine3.11 AS base

ENV LANG="C.UTF-8"
ENV RUNTIME_LIBS="mariadb-connector-c tzdata"
ENV BUILD_LIBS="build-base mariadb-connector-c-dev"
ENV WORKSPACE="/opt/app/src"

RUN mkdir -p $WORKSPACE && \
    apk add --no-cache $RUNTIME_LIBS

WORKDIR $WORKSPACE

EXPOSE 3000

FROM base AS dev

RUN apk add --no-cache $BUILD_LIBS

ADD https://github.com/ufoscout/docker-compose-wait/releases/download/2.7.3/wait /wait
RUN chmod +x /wait

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

ENTRYPOINT [ \
  "prehook", "sh -c /wait", "--", \
  "prehook", "bundle install", "--" ]

FROM base AS build

RUN apk add --no-cache $BUILD_LIBS

COPY src/.bundle $WORKSPACE/.bundle
COPY src/Gemfile.cache $WORKSPACE/Gemfile
COPY src/Gemfile.lock.cache $WORKSPACE/Gemfile.lock

RUN bundle install --deployment

COPY src/Gemfile $WORKSPACE
COPY src/Gemfile.lock $WORKSPACE

RUN bundle install --deployment

FROM base

COPY src $WORKSPACE
COPY --from=build $WORKSPACE/vendor $WORKSPACE/vendor
COPY --from=build /usr/local/bundle /usr/local/bundle

RUN addgroup --gid 1000 --system rails && \
  adduser \
    --disabled-password \
    --gecos "" \
    --ingroup rails \
    --no-create-home \
    --uid 1000 \
    rails && \
  chown -R rails:rails $WORKSPACE

USER rails

CMD ["bundle", "exec", "rails", "server", "-b", "0.0.0.0"]