title: RVM environment variable
body: <p>For my Ruby on Rails project I have to do a lot of stuff in the command line, like running rake tasks or running test specs. In my app I need to supply an environment variable to do this, e.g. <code>ENCRYPTION_PASSWORD=bla rake db:test:prepare</code></p>
  
  <p>What is a good way to add environment variables to RVM, so I don't have to use the variable every single time in the command line? Thanks!</p>