Commits on Jan 10, 2019

1. Close #847 Allow apps to enable RUBYOPT=--jit …

   If you set:
   
   ```
   $ heroku config:set RUBYOT=--jit
   ```
   
   Then this will be a global value so when the buildpack attempts to detect ruby version by running:
   
   ```
   $ bundle platform --ruby
   ```
   
   It is executed with the RUBYOPT set. Since the version of Ruby the buildpack executes does not have `--jit` it fails:
   
   ```
   -----> Ruby app detected
   -----> Compiling Ruby/Rails
    !
    !     There was an error parsing your Gemfile, we cannot continue
    !     ruby: invalid option --jit  (-h will show valid options) (RuntimeError)
    !
    !     Push rejected, failed to compile Ruby app.
    !     Push failed
   ```

   

   schneems committed Jan 10, 2019
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