add gitlab-rake.sh

this would behave like gitlab-rake from omnibus install

diff --git a/gitlab-rake.sh b/gitlab-rake.sh
new file mode 100755 (executable)
index 0000000..b898654
--- /dev/null
+++ b/gitlab-rake.sh
@@ -0,0 +1,16 @@
+#!/bin/sh
+set -e
+
+# 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 $ruby_env_var
+done
+
+cd /var/lib/gitlab
+exec sudo -u gitlab bundle exec rake RAILS_ENV=production "$@"