test: add e2e tests via playwright

Signed-off-by: Richard Steinmetz <richard@steinmetz.cloud>

php/tests/playwright.config.js

@@ -0,0 +1,29 @@
+import { defineConfig, devices } from '@playwright/test'
+
+/**
+ * @see https://playwright.dev/docs/test-configuration
+ */
+export default defineConfig({
+  testDir: './tests',
+  fullyParallel: false,
+  forbidOnly: !!process.env.CI,
+  retries: 0,
+  workers: 1,
+  reporter: [
+    ['list'],
+    ['html'],
+  ],
+  use: {
+    baseURL: process.env.BASE_URL ?? 'http://localhost:8080',
+    trace: 'on',
+  },
+  projects: [
+    {
+      name: 'chromium',
+      use: {
+        ...devices['Desktop Chrome'],
+        ignoreHTTPSErrors: true,
+      },
+    },
+  ],
+})