Keep mobile storage paths container-relative

crates/storage/src/mobile_key_transfer.rs

@@ -842,6 +842,9 @@ mod tests {
                 .as_str(),
             ALICE_FINGERPRINT
         );
+        let config = std::fs::read_to_string(fixture.config.source())?;
+        assert!(config.contains("vault = \"vault\""));
+        assert!(config.contains("key_material = \"keys\""));
         Ok(())
     }
 
@@ -870,8 +873,8 @@ mod tests {
         std::fs::write(
             &config_path,
             format!(
-                "vault = {:?}\ndefault_key = {:?}\nkey_material = {:?}\n",
-                vault, ALICE_FINGERPRINT, keys
+                "vault = \"vault\"\ndefault_key = {:?}\nkey_material = \"keys\"\n",
+                ALICE_FINGERPRINT
             ),
         )?;
         let config = Config::load(Some(&config_path))?;