Merge branch 'unset_ruby_env_vars' into 'master'

Unset ruby envs for gitlab-rake and gitlab-rails scripts.

Fixes gitlab-org/gitlab-ce#13689

See merge request !658

config/templates/gitlab-rails/bundle_exec_wrapper.erb

@@ -1,5 +1,16 @@
 #!/bin/sh
 
+# Unset ENV variables that might interfere with
+# omnibus-gitlab ruby env (looking at you rvm)
+for ruby_env_var in RUBYOPT \
+                    BUNDLE_BIN_PATH \
+                    BUNDLE_GEMFILE \
+                    GEM_PATH \
+                    GEM_HOME
+do
+  unset $ruby_env_var
+done
+
 error_echo()
 {
   echo "$1" 2>& 1