ruby2.3.2, chrome headless, alpine Dockerfile

Dockerfile.alpine

FROM ruby:2.4.2-alpine3.4
MAINTAINER Lucas Charles (theoretick) <me@lucascharles.me>

EXPOSE 8080

ENV APP_PATH /srv/app

RUN echo "http://dl-4.alpinelinux.org/alpine/v3.4/main" >> /etc/apk/repositories && \
  echo "http://dl-4.alpinelinux.org/alpine/v3.4/community" >> /etc/apk/repositories

# RUN apk update && \
#   apk add curl unzip libexif udev chromium chromium-chromedriver xvfb
RUN apk add --update \
  build-base \
  libxml2-dev \
  libxslt-dev \
  postgresql-dev \
  curl unzip libexif udev chromium chromium-chromedriver xvfb xorg-server dbus ttf-freefont mesa-dri-swrast \
  && rm -rf /var/cache/apk/*

WORKDIR $APP_PATH

# Do not generate documentation when installing gems and fix shebang
# lines
RUN echo "gem: --no-rdoc --no-ri --env-shebang" >> "$HOME/.gemrc"

ADD [".gems", "/srv/app/.gems"]

RUN gem install dep shotgun rake pry
RUN dep -f /srv/app/.gems install

# Tell pry to use `more` as the pager because the installed
# version of `less` does not support passing the `-R` which
# is used by pry.
ENV PAGER="more"

ENV CHROME_BIN=/usr/bin/chromium-browser
ENV CHROME_PATH=/usr/lib/chromium/

CMD ["puma", "--bind", "tcp://0.0.0.0", "--port", "8080"]