miniconda image does not install from environment.yml

https://github.com/devcontainers/images/blob/9bb5c4f0540a9a54b0d4ea4151b737c7af2f8aec/src/miniconda/README.md?plain=1#L106

Running VS Code 1.86.0 with Dev Containers v0.338.1.

Including an `environment.yml` does not actually update the base environment when the dev container is rebuilt, when `.devcontainer/devcontainer.json` is the following:

```jsonc
{
"name": "Python 3",
"image": "mcr.microsoft.com/devcontainers/miniconda:0.203-3"
}
```

This seems logical in retrospect, as the local `environment.yml` has not been present when the image is built.