allow nginx config extension

installer/inventory

@@ -111,3 +111,9 @@ secret_key=awxsecret
 # /etc/pki/ca-trust in the awx_task and awx_web containers.
 # NOTE: only obeyed in local_docker install
 #ca_trust_dir=/etc/pki/ca-trust
+
+# Include /etc/nginx/awx_extra.conf
+# Note the use of glob pattern for nginx
+# which makes include "optional" - i.e. not fail
+# if file is absent
+#extra_nginx_include="/etc/nginx/awx_extra[.]conf"