Set overwriteprotocol to HTTPS in Codespace

Codespace is serving everything only as HTTPS. To keep the URLs valid, we also need to overwrite the protocol. (otherwise e.g. you can't develop the SAML app as the URLs are invalid)

Signed-off-by: Lukas Reschke <lukas@statuscode.ch>

.devcontainer/codespace.config.php

@@ -14,4 +14,5 @@ $CONFIG = [
 
 if($cloudEnvironmentId !== true) {
     $CONFIG['overwritehost'] = $cloudEnvironmentId . '-80.apps.codespaces.githubusercontent.com';
+    $CONFIG['overwriteprotocol'] = 'https';
 }