🔧 Update Playwright config and tests to use env variables (#1266)

frontend/tests/config.ts

@@ -0,0 +1,21 @@
+import dotenv from 'dotenv';
+import path from 'path';
+import { fileURLToPath } from 'url';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+dotenv.config({ path: path.join(__dirname, '../../.env') });
+
+const { FIRST_SUPERUSER, FIRST_SUPERUSER_PASSWORD } = process.env;
+
+if (typeof FIRST_SUPERUSER !== "string") {
+  throw new Error("Environment variable FIRST_SUPERUSER is undefined");
+}
+
+if (typeof FIRST_SUPERUSER_PASSWORD !== "string") {
+  throw new Error("Environment variable FIRST_SUPERUSER_PASSWORD is undefined");
+}
+
+export const firstSuperuser = FIRST_SUPERUSER as string;
+export const firstSuperuserPassword = FIRST_SUPERUSER_PASSWORD as string;