Could not locate Gemfile

[kazhian]

When I execured this command: docker run -p 3000:3000 -v pwd:/projectmonitor pivotaliad/project-monitor \bash -c "cd projectmonitor && bundle install && RAILS_ENV=development rake local:start"

I got below error

• Starting MySQL database server mysqld
  ...done.
  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.
  Could not locate Gemfile

[DALDEI]

I had the same problem -- turns out "one liner" is misleading.
You first have to clone the github repo, cd into it then run the docker command.