Fix CI for external contributed PRs

[tobrun]

Our CI workflow doesn't expose env. variables for security reasons when running PRs coming from forked repositories. We need to optimise our workflow to not execute steps that require them. Example of failed build here.

cc @mapbox/maps-android

[stale[bot]]

Is this still relevant? If so, what is blocking it? Is there anything you can do to help move it forward?

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[stale[bot]]

This issue has been automatically detected as stale because it has not had recent activity and will be archived. Thank you for your contributions.