override gems from knapsack with bundler inject

Author: orangewolf

.gitignore

@@ -55,3 +55,4 @@ public/uploads
 docker-compose.override.yml
 *~undo-tree~
 .DS_Store
+/bundler.d/

Gemfile

@@ -1,5 +1,10 @@
 # frozen_string_literal: true
 
+# for knapsack overrides of gems. See https://github.com/ManageIQ/bundler-inject
+# set BUNDLE_BUNDLER_INJECT__GEM_PATH in your knapsack to point at the knapsack override file.
+plugin 'bundler-inject'
+require File.join(Bundler::Plugin.index.load_paths("bundler-inject")[0], "bundler-inject") rescue nil
+
 # rubocop:disable Layout/LineLength
 source 'https://rubygems.org'