Dockerfile

FROM ruby:2.6.3-slim
LABEL maintainer Travis CI GmbH <support+docs-docker-images@travis-ci.com>

# packages required for bundle install
RUN ( \
   apt-get update ; \
   apt-get install -y --no-install-recommends git make gcc g++ libpq-dev libcurl4-openssl-dev curl \
   && rm -rf /var/lib/apt/lists/* \
)

# ------
# Set the encoding to UTF-8
ENV LC_ALL C.UTF-8
ENV LANG en_US.UTF-8
ENV LANGUAGE en_US.UTF-8
# -----
ENV WEBHOOK_PAYLOAD_GIST_ID 4e317d6e71be6d0278be46bb751b2f78

# throw errors if Gemfile has been modified since Gemfile.lock
RUN bundle config --global frozen 1
RUN mkdir -p /app

WORKDIR /app
COPY Gemfile      /app
COPY Gemfile.lock /app

RUN gem install bundler
RUN bundler install --verbose --retry=3
RUN gem install --user-install executable-hooks

COPY . /app
RUN bundle exec rake build
COPY . /app

CMD bundle exec puma -p 4000