CI: Try to skip macOS jobs on forks
An attempt to skip macOS jobs on MR from forks.
Fixes #1808 (closed). At least I hope it does.
The 17.0 major release is coming on May 16, 2024! This version brings many exciting improvements to GitLab, but also removes some deprecated features. We are introducing three breaking change windows during which we expect breaking changes to be deployed to GitLab.com. You can read more about it on our blogpost. The first breaking change window begins 2024-04-22 09:00UTC and ends 2024-04-24 22:00UTC.
An attempt to skip macOS jobs on MR from forks.
Fixes #1808 (closed). At least I hope it does.