Currently, create-vue generates a playwright config that has something like this in it:

{ webServer: { /**  * use the dev server by default for faster feedback loop. Use the preview  * server on CI for more realistic testing  */ command: process.env.CI ? "vite preview --port 5173" : "vite dev", port: 5173, reuseExistingServer: !process.env.CI, } }

Shouldn't we need to run build before preview so that the app actually exists?

I ran into problems running my tests on GitHub Actions, and it took me a while to figure out that this was the cause. See:
vitejs/vite#4572