Update user_management.md

add rails_env to commands

doc/raketasks/user_management.md

@@ -7,7 +7,7 @@
 sudo gitlab-rake gitlab:import:user_to_projects[username@domain.tld]
 # installation from source or cookbook
-bundle exec rake gitlab:import:user_to_projects[username@domain.tld]
+RAILS_ENV=production bundle exec rake gitlab:import:user_to_projects[username@domain.tld]
 ```
 ## Add all users to all projects
@@ -21,7 +21,7 @@ Notes:
 sudo gitlab-rake gitlab:import:all_users_to_all_projects
 # installation from source or cookbook
-bundle exec rake gitlab:import:all_users_to_all_projects
+RAILS_ENV=production bundle exec rake gitlab:import:all_users_to_all_projects
 ```
 ## Add user as a developer to all groups
@@ -31,7 +31,7 @@ bundle exec rake gitlab:import:all_users_to_all_projects
 sudo gitlab-rake gitlab:import:user_to_groups[username@domain.tld]
 # installation from source or cookbook
-bundle exec rake gitlab:import:user_to_groups[username@domain.tld]
+RAILS_ENV=production bundle exec rake gitlab:import:user_to_groups[username@domain.tld]
 ```
 ## Add all users to all groups
@@ -45,5 +45,5 @@ Notes:
 sudo gitlab-rake gitlab:import:all_users_to_all_groups
 # installation from source or cookbook
-bundle exec rake gitlab:import:all_users_to_all_groups
+RAILS_ENV=production bundle exec rake gitlab:import:all_users_to_all_groups
 ```