Can't build - bash: ./build.sh: No such file or directory

Trying to build a custom version of ffmpeg - followed the instructions:

```
$ git clone https://github.com/ffmpegwasm/ffmpeg.wasm-core
$ git submodule update --init --recursive
```

Installed docker
https://docs.docker.com/desktop/install/windows-install/

Installed WSL2 (as I'm on windows)
NAME STATE VERSION
* docker-desktop Running 2
docker-desktop-data Running 2

Adjusted configure-ffmpeg.sh

Ran $ bash build-with-docker.sh - it downloaded a few things and all completed and installed sucessfully

Then the last thing it says is as the title says:
```
$ bash build-with-docker.sh
2.0.8: Pulling from emscripten/emsdk
Digest: sha256:68672cb7faba80d4bb3d93d7f3df9f7543b2b91878bd673f0057a49485ceb1f4
Status: Image is up to date for emscripten/emsdk:2.0.8
docker.io/emscripten/emsdk:2.0.8
bash: ./build.sh: No such file or directory
```

I'm running Windows 11 x64

Any help is much appreciated