add relative_url_root to webpacker config (#1236)
add relative_url_root to webpacker config (#1236)


rossta/webpacker,rossta/webpacker,gauravtiwari/webpacker,gauravtiwari/webpacker,rossta/webpacker,rails/webpacker,rossta/webpacker,gauravtiwari/webpacker,rails/webpacker