Local compile of a Travis CI file

Dockerfile.travis-build

# Base image is ruby
FROM ruby:2.6.3


# Create local directory
RUN mkdir  /root/.travis
WORKDIR /root/.travis

# Clone Travis repository
RUN git clone --branch v10.0.0 --depth=1 https://github.com/travis-ci/travis-build

# Install bundler
RUN gem install bundler

# Install everything that we need from Gemfile
RUN bundle install --gemfile ~/.travis/travis-build/Gemfile
WORKDIR /root/.travis/travis-build
RUN bundler binstubs travis


# Run shell
CMD ["/bin/bash"]