Install any gem binary on servers that forbid gem install

Our servers only have system-wide rubies, where gem install is verboten for normal users,
but there is a simple way around that:

  • make a ~/gems folder
  • add a Gemfile with all the gems you want
  • bundle --binstubs --path vendor/bundle
  • export PATH="~/gems/bin:$PATH"

For bonus points: automate it!

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