tests: Use an env variable for the private seed

server/tests/common/env.rs

@@ -2,6 +2,7 @@
 use std::env::var;
 
 pub const DB_KEY: &str = "LLDAP_DATABASE_URL";
+pub const PRIVATE_KEY_SEED: &str = "LLDAP_KEY_SEED";
 
 pub fn database_url() -> String {
     let url = var(DB_KEY).ok();