$ ./build.sh docker
Step 16/27 : RUN bundle install --gemfile=/tmp/Gemfile
---> Running in 79407933cb02
Don't run Bundler as root. Bundler can ask for sudo if it is needed, and
installing your bundle as root will break this application for all non-root
users on this machine.
Fetching gem metadata from https:Fetching version metadata from https:Resolving dependencies...
rubocop-0.82.0 requires ruby version >= 2.4.0, which is incompatible with the
current version, ruby 2.3.3p222
The command '/bin/sh -c bundle install --gemfile=/tmp/Gemfile' returned a non-zero code: 5