This might fix Github action deploys for others

[toranb]

toranb@e919a3b

I only know this worked for my team who's been using your amazing GHAction for the last year (thank you btw). Before this change I was getting the error message Pseudo-terminal will not be allocated because stdin is not a terminal

People with this issue can read about it in more detail above^. TL;DR gigalixir-cli made a change supporting a custom -tt option that seems to have saved the day.