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Dockerfile
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FROM ruby:2.6.5
RUN apt-get update -qq && apt-get install -y nodejs postgresql-client
RUN mkdir /app
WORKDIR /app
COPY requirements/Gemfile /app/Gemfile
COPY requirements/Gemfile.lock /app/Gemfile.lock
RUN bundle install
#COPY . /app
# install Yarn
RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
RUN apt-get update && apt-get install -y yarn
# install webpacker
RUN bundle exec rails webpacker:install
# build project
RUN rails new . --force --database=postgresql
# update database.yml
COPY config/database.yml /app/config/database.yml
# Add a script to be executed every time the container starts.
COPY entrypoint.sh /usr/bin/
RUN chmod +x /usr/bin/entrypoint.sh
ENTRYPOINT ["entrypoint.sh"]
EXPOSE 3000
# Start the main process.
CMD ["rails", "server", "-b", "0.0.0.0"]