This is like a "Hello World" rails app. You should have RVM installed. To setup,
just cd into this directory to have RVM build the gemset (install ruby-2.6.5
if you need to), and then run bundle install.
Deploy with ./deploy_to_google_cloud.sh.
Notice that the cloud build fails. To make it succeed, comment out the last line
in Gemfile (active scaffold), and then run bundle install again to update
the Gemfile.lock, and then deploy. It will succeed. The cloud builder
apparently has some kind of permission problem when installing gems from git
repositories.