Dockerfile
FROM ruby:2.6.5-alpine
RUN apk add --no-cache \
ca-certificates \
wget \
openssl \
bash \
build-base \
git \
sqlite-dev \
tzdata
ENV LANG en_US.UTF-8
ENV LANGUAGE en_US:en
ENV LC_ALL en_US.UTF-8
ENV BUNDLER_VERSION 2.1.4
RUN gem install bundler -v ${BUNDLER_VERSION} -i /usr/local/lib/ruby/gems/$(ls /usr/local/lib/ruby/gems) --force
WORKDIR /srv
COPY Gemfile doorkeeper.gemspec /srv/
COPY lib/doorkeeper/version.rb /srv/lib/doorkeeper/version.rb
RUN bundle install
COPY . /srv/
CMD ["rake"]