ci: gate demo deploy

playwright.demo.config.ts

@@ -0,0 +1,26 @@
+import { defineConfig, devices } from "@playwright/test";
+
+const demoPort = 4174;
+const demoBaseUrl = `http://127.0.0.1:${demoPort}`;
+
+export default defineConfig({
+  testDir: "./tests/e2e-demo",
+  timeout: 30_000,
+  expect: { timeout: 10_000 },
+  fullyParallel: false,
+  retries: process.env.CI ? 1 : 0,
+  workers: 1,
+  reporter: process.env.CI ? "github" : "list",
+  use: {
+    baseURL: demoBaseUrl,
+    ...devices["Desktop Chrome"],
+    screenshot: "only-on-failure",
+    trace: "retain-on-failure",
+  },
+  webServer: {
+    command: `pnpm --filter @snapotter/demo exec vite preview --host 127.0.0.1 --port ${demoPort} --strictPort`,
+    url: demoBaseUrl,
+    reuseExistingServer: false,
+    timeout: 60_000,
+  },
+});