test: workers 1 but fullyParallel?

Author: hi-ogawa

packages/plugin-rsc/playwright.config.ts

@@ -27,6 +27,7 @@ export default defineConfig({
     },
   ],
   workers: 1,
+  fullyParallel: true,
   forbidOnly: !!process.env.CI,
   retries: process.env.CI ? 2 : 0,
   reporter: ['list', process.env.CI && 'github']