[ci] Fix the playwright-chromium Dockerfile (#94064)
Added in https://github.com/vercel/next.js/pull/94051
Failing in canary:
https://github.com/vercel/next.js/actions/runs/26311675098
Successful `workflow_dispatch` job here:
https://github.com/vercel/next.js/actions/runs/26319776612/job/77486403513
Tested locally with
```
podman build . --build-arg=NODE_VERSION=20.9.0 --build-arg=PLAYWRIGHT_VERSION=1.58.2
```
If you're on arm64, you need to change the url from `fnm-linux.zip` to
`fnm-arm64.zip` and update the checksum.
