Set path attribute in session cookie when relative url is set (#5651)

* Set path attribute in session cookie when relative url is set

* Update session_store.rb

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Co-authored-by: Ahmad Farhat <ahmad.farhat@blindsidenetworks.com>

config/initializers/session_store.rb

@@ -17,7 +17,8 @@
 # frozen_string_literal: true
 
 if ENV['LOADBALANCER_ENDPOINT'].present?
-  Rails.application.config.session_store :cookie_store, key: '_greenlight-3_0_session', domain: ENV.fetch('SESSION_DOMAIN_NAME', nil)
+  Rails.application.config.session_store :cookie_store, key: '_greenlight-3_0_session', domain: ENV.fetch('SESSION_DOMAIN_NAME', nil),
+                                                        path: ENV.fetch('RELATIVE_URL_ROOT', '/')
 else
-  Rails.application.config.session_store :cookie_store, key: '_greenlight-3_0_session'
+  Rails.application.config.session_store :cookie_store, key: '_greenlight-3_0_session', path: ENV.fetch('RELATIVE_URL_ROOT', '/')
 end