Make Nginx Logs Format Configurable

- Defaults to JSON in Production and Combined in Dev

Author: sherifabdlnaby

docker/nginx/conf.d/json-logs.conf

@@ -1,4 +1,4 @@
 # logging
-log_format json_combined escape=json '{"@timestamp":"$time_iso8601","request_time":"$request_time","method":"$request_method","status":"$status","path":"$request_uri","request_query":"$args","vhost":"$host","bytes_sent":"$bytes_sent","request_length":"$request_length","request_proto":"$server_protocol","remote_user":"$remote_user","remote_addr":"$remote_addr","http_referrer":"$http_referer","http_user_agent":"$http_user_agent"}';
-access_log /dev/stdout json_combined;
+log_format json escape=json '{"@timestamp":"$time_iso8601","status":"$status","method":"$request_method","path":"$request_uri","request_query":"$args","request_time":"$request_time","vhost":"$host","bytes_sent":"$bytes_sent","request_length":"$request_length","request_proto":"$server_protocol","remote_user":"$remote_user","remote_addr":"$remote_addr","http_referrer":"$http_referer","http_user_agent":"$http_user_agent"}';
+access_log /dev/stdout ${NGINX_LOG_FORMAT}
 error_log /dev/stderr warn;