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 runbuild beforepreview 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