certificates: add support for tar file based certificate storage

Fixes: WIFI-14694
Signed-off-by: John Crispin <john@phrozen.org>

feeds/tip/cloud_discovery/files/usr/bin/est_client

@@ -42,7 +42,8 @@ function generate_csr(cert) {
 function store_operational_cert(path, target) {
 	system('mount_certs');
 	system(`cp ${path} /certificates/${target}`);
-	
+	system('store_certs');
+
 	ulog(LOG_INFO, `Persistently stored ${target}\n`);
 }