CircleCI made an announcement on macOS hosts availability. This allows usage of various Xcode versions for iOS and macOS development.
Dedicated hosts are available on all paid plans and are priced at 100 credits/min with a 24-hour minimum lease period.Circle CI
CircleCI blog: Dedicated hosts for macOS are now available
Developer:Consider using CircleCI, if applicable.
QA engineer:Business as usual.
PM/DM:Consider using CircleCI, if applicable.