chore: Go back to previous return type for loadFile

[CristhianMotoche]

Change

After reviewing the question described by @nsaunders I think it would be best to return to the initial return value for loadFile. It would make more sense since it's an action that doesn't need to return the list of environment variables loaded. It's main purpose is to load the envs from a file before running another action.

[nsaunders]

Glad to see this change, thanks again!