Sign-in goes straight to the identity provider

With single sign-on there is nothing to choose, so /authorize redirects to
it; the page shows only when something went wrong there.
Server 0.1.3, chart 0.1.4.

crates/server/src/pages.rs

@@ -190,6 +190,11 @@ pub async fn authorize_page(
     State(state): State<AppState>,
     Query(q): Query<AuthorizeQuery>,
 ) -> Response {
+    // With single sign-on there is nothing to choose: straight to the identity
+    // provider. The page only shows when something went wrong there.
+    if state.oidc.is_some() && check_authorize(&state, &q).is_ok() {
+        return Redirect::to(&format!("/oidc/start?{}", q.to_query_string())).into_response();
+    }
     authorize_form(&state, &q, None).await
 }