Add retry

[sophiewigmore]

Hey! Occasionally, our login step fails due to rate-limiting or the system we're logging into being unavailable. It would be super useful to have a retry flag of some kind. Based on similar functionality for other actions in the space, imagining it might look like:

- name: Login
   uses: docker/login-action@v3
   with:
       registry: ...
       username: ...
       password: ...
       retries: 3