Envbuilder create git repo folder with a trailing `.git`

[ggjulio]

It seem that the function here does not work as expected : https://github.com/coder/envbuilder/blob/8c5c50cad3ae396b73619d36da43ef2ff0ac0be8/envbuilder.go#L966

Reproduction

I used the devcontainer-kubernetes with almost no modifications.
(only added auth for git (bitbucket) + a few modules )