Add support for mutual-tls feature flag

.env.template

@@ -353,6 +353,7 @@
 ## - "inline-menu-positioning-improvements": Enable the use of inline menu password generator and identity suggestions in the browser extension.
 ## - "ssh-key-vault-item": Enable the creation and use of SSH key vault items. (Needs clients >=2024.12.0)
 ## - "ssh-agent": Enable SSH agent support on Desktop. (Needs desktop >=2024.12.0)
+## - "mutual-tls": Enable the use of mutual TLS on Android (Client >= 2025.2.0)
 # EXPERIMENTAL_CLIENT_FEATURE_FLAGS=fido2-vault-credentials
 
 ## Require new device emails. When a user logs in an email is required to be sent.

src/config.rs

@@ -842,6 +842,7 @@ fn validate_config(cfg: &ConfigItems) -> Result<(), Error> {
         "inline-menu-positioning-improvements",
         "ssh-key-vault-item",
         "ssh-agent",
+        "mutual-tls"
     ];
     let configured_flags = parse_experimental_client_feature_flags(&cfg.experimental_client_feature_flags);
     let invalid_flags: Vec<_> = configured_flags.keys().filter(|flag| !KNOWN_FLAGS.contains(&flag.as_str())).collect();