How to use `forge` as formatter in vs code?

[merklefruit]

I haven't found much on the foundry book related to this. How do I install the forge formatter to use it in vsc?

https://github.com/transmissions11/foundry-template/blob/b390c0c80a929b268e911c4d897b9aaea1641a54/.vscode/settings.json#L5

Value is not accepted. Valid values: "none", "prettier".