Dockerfile

FROM ruby:2.6.5-alpine3.10

ENV WEB_PORT 80
ENV BUILD_PACKAGES nginx nodejs tzdata postgresql-dev alpine-sdk yarn imagemagick
ENV UPDATE_PACKAGES libxml2 libxslt sqlite bash

WORKDIR /app
ENV HOME /app

RUN set -ex && \
    apk --update add --no-cache $BUILD_PACKAGES && \
    apk add --no-cache -u $UPDATE_PACKAGES && \
    ln -sf /dev/stdout /var/log/nginx/access.log && \
    ln -sf /dev/stderr /var/log/nginx/error.log && \
    rm -rf /var/cache/apk/* && \
    :

COPY Gemfile Gemfile.lock ./
RUN set -ex && \
    bundle install --clean --no-cache --deployment --without development && \
    # Remove unneeded files (apk cache, cached *.gem, *.o, *.c)
    rm -rf vendor/bundle/ruby/*/cache && \
    find vendor/bundle/ -name "*.c" -delete && \
    find vendor/bundle/ -name "*.o" -delete  && \
    rm -rf /var/cache/apk/* && \
    :

COPY config/nginx.conf /etc/nginx/nginx.conf
RUN nginx -t -c /etc/nginx/nginx.conf

COPY . .

RUN set -ex && \
    yarn install && \
    SECRET_KEY_BASE=12id83maj10mjmahyabv978ba7lldlmernkandji83jnmanoqppaajey NODE_ENV=development RAILS_ENV=production bundle exec rake assets:precompile && \
    yarn cache clean && \
    rm -rf /usr/lib/node_modules node_modules/.cache tmp/cache lib/assets && \
    :

RUN set -ex && \
    chown -R nginx:nginx /app && \
    nginx -t && \
    :

EXPOSE $WEB_PORT

CMD ["./bin/docker-entrypoint.sh"]