--no-rdoc and --no-ri cannot be passed to gem install or bundle install in ruby 2.6

bin/run-tests-with-docker.sh

@@ -1,5 +1,5 @@
 #!/bin/bash -e
-project_dir="$(dirname $( dirname $(readlink -f ${BASH_SOURCE[0]})))"
+project_dir="$(dirname $(readlink -f ${BASH_SOURCE[0]}))/.."
 
 docker build -f ${project_dir}/deploy/rails-prod-Dockerfile -t wrestlingdevtests ${project_dir}/.
 docker run -it wrestlingdevtests bash /rails/bin/run-all-tests.sh

deploy/rails-dev-Dockerfile

@@ -16,10 +16,11 @@ RUN echo "America/New_York" > /etc/timezone \
  && rm /etc/localtime \
  && ln -s /usr/share/zoneinfo/America/New_York /etc/localtime
 
-RUN gem install --no-rdoc --no-ri bundler
+RUN echo 'gem: --no-rdoc --no-ri' > /root/.gemrc
+RUN gem install bundler
 ADD Gemfile* /tmp/
 WORKDIR /tmp
-RUN bundle install --without production
+RUN bundle install --jobs 4 --without production
 
 RUN mkdir /rails
 WORKDIR /rails

deploy/rails-prod-Dockerfile

@@ -24,13 +24,14 @@ RUN apt-get -qq update \
     /tmp/* \
     /var/tmp/*
 
-RUN gem install --no-rdoc --no-ri bundler
+RUN echo 'gem: --no-rdoc --no-ri' > /root/.gemrc
+RUN gem install bundler
 #Cache gems so they don't install on every code change
 RUN rm -rf /rails && mkdir /rails
 WORKDIR /rails
 COPY Gemfile Gemfile
 COPY Gemfile.lock Gemfile.lock
-RUN bundle install
+RUN bundle install --jobs 4
 
 # Copy site into place.
 ADD . /rails/