Expose configuration of the Unicorn memory constraints from `unicorn.rb`

Summary

We currently hard code the values that control the unicorn memory killer, but we should expose them even if rarely configured by a user of the chart.

Current behavior

    ENV['GITLAB_UNICORN_MEMORY_MIN'] = (400 * 1 << 20).to_s
    ENV['GITLAB_UNICORN_MEMORY_MAX'] = (650 * 1 << 20).to_s

Expected behavior

    ENV['GITLAB_UNICORN_MEMORY_MIN'] = ({{ .Values.memory.min | toInt }} * 1 << 20).to_s
    ENV['GITLAB_UNICORN_MEMORY_MAX'] = ({{ .Values.memory.max | toInt }} * 1 << 20).to_s

Versions

Edited by Jason Plum