feat: Pass credentials through environment variables

[RaniAgus]

Eg:

read GITHUB_USER
export GITHUB_USER

read -s GITHUB_TOKEN
export GITHUB_TOKEN

./deploy.sh ...

[mesaglio]

If we use gh cli, we dont need to modify repo url. We can integrate this with gh-token-api

[RaniAgus]

Maybe gh-token-api could be an HTTP server that takes care of fetching the repo itself, eg:

git clone http://192.168.0.1/tp-2025-1c-los-borbotones

And we could investigate if it's possible to add an auth layer for that endpoint, so it becomes:

git clone http://192.168.0.1/tp