Customizing Apache environment variables

As of revision 20e16c7042, Moonshine allows the customization of Apache's runtime environment variables, ie through /etc/apache2/envvars.

The most common uses of this would be for tuning Ruby's garabage collector. If, for example, you followed this article's recommendation, you'd add this to your config/moonshine.yml:

:apache:
  :envvars:
    RUBY_HEAP_MIN_SLOTS: 1250000
    RUBY_HEAP_SLOTS_INCREMENT: 100000
    RUBY_HEAP_SLOTS_GROWTH_FACTOR: 1
    RUBY_GC_MALLOC_LIMIT: 30000000
    RUBY_HEAP_FREE_MIN: 12500