ci: start devServer before test running to avoid tests timeout (#11297)

tests/affine-local/dev-server.ts

@@ -0,0 +1,35 @@
+import { getConfig, start } from '@affine-tools/cli/bundle';
+import { Workspace } from '@affine-tools/utils/workspace';
+import webpack from 'webpack';
+
+export default async () => {
+  const ws = new Workspace();
+  const webpackConfig = await getConfig(ws.getPackage('@affine/web'), true);
+  const definedPort = webpackConfig.devServer?.port ?? 8080;
+
+  await new Promise<void>((resolve, reject) => {
+    start(webpack(webpackConfig), {
+      ...webpackConfig.devServer,
+      onListening: server => {
+        // dev server has already started
+        if (server.options.port !== definedPort) {
+          server.compiler.close(reject);
+          server.stop().catch(reject);
+          resolve();
+        }
+      },
+      proxy: [],
+    })
+      .then(server => {
+        server.middleware?.waitUntilValid?.(stats => {
+          if (stats?.hasErrors()) {
+            reject(new Error('Webpack build failed'));
+          } else {
+            resolve();
+          }
+        });
+      })
+      .catch(reject);
+  });
+  console.log('Dev server started');
+};