oidc: allow post logout redirect back to the app

src/oidc.js

@@ -294,6 +294,9 @@ class CloudronAdapter {
                 // prefix login redirect uris with app.fqdn if it is just a path without a schema
                 // native callbacks for apps have custom schema like app.immich:/
                 tmp.redirect_uris = client.loginRedirectUri.split(',').map(s => s.trim()).map(s => url.parse(s).protocol ? s : `https://${app.fqdn}${s}`);
+
+                // TODO this may need to come from the manifest like loginRedirectUri, but we have to first check other client implementations
+                tmp.post_logout_redirect_uris = [ `https://${app.fqdn}` ];
             } else {
                 tmp.redirect_uris = client.loginRedirectUri.split(',').map(s => s.trim());
             }