Dockerfile.erb

FROM <%= ENV['FROM_IMAGE'] %>

# Cleanup expired Let's Encrypt CA (Sept 30, 2021)
RUN sed -i '/^mozilla\/DST_Root_CA_X3/s/^/!/' /etc/ca-certificates.conf && update-ca-certificates -f

<% rubygems_version = ENV['RUBYGEMS_VERSION'] %>
<%= "RUN gem update --system #{rubygems_version}" unless rubygems_version.empty? %>

# Install prerequisites
RUN \
  apt-get update && \
  DEBIAN_FRONTEND=noninteractive apt-get install -y runit nginx nodejs && \
  apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

# Prepare application directory
RUN mkdir /app
WORKDIR /app

# Adding scripts and configuration files
ADD files/runit-bootstrap /usr/local/sbin/runit-bootstrap
ADD files/runit-nginx-run /etc/service/nginx/run
ADD files/nginx-app.conf /etc/nginx/sites-enabled/app.conf
RUN rm /etc/nginx/sites-enabled/default

# Set environment and expose port
ENV RAILS_ENV production
EXPOSE 80

CMD ["/usr/local/sbin/runit-bootstrap"]