Add CI check ensuring interfaces have return types

Author: wouterj

Adapter/ConnectionInterface.php

@@ -31,6 +31,8 @@ public function isBound(): bool;
      * @throws AlreadyExistsException      When the connection can't be created because of an LDAP_ALREADY_EXISTS error
      * @throws ConnectionTimeoutException  When the connection can't be created because of an LDAP_TIMEOUT error
      * @throws InvalidCredentialsException When the connection can't be created because of an LDAP_INVALID_CREDENTIALS error
+     *
+     * @return void
      */
     public function bind(string $dn = null, #[\SensitiveParameter] string $password = null);
 }

LdapInterface.php

@@ -29,6 +29,8 @@ interface LdapInterface
      * Return a connection bound to the ldap.
      *
      * @throws ConnectionException if dn / password could not be bound
+     *
+     * @return void
      */
     public function bind(string $dn = null, #[\SensitiveParameter] string $password = null);