Recommendations for remote Mac access?

I am a Unity developer and have created a mobile app. It's completed and released on Google Play, and I'd like to release it on iPhone as well. However I do not own a Mac. I've tried to use friends' Macs for this, but things always get in the way. I've already created my Apple account, paid the $100 for a year of developer access, etc.

I'm looking for a service where I can use a Mac remotely, install Unity, download my Git repo, and make a build in Unity and XCode. If you have any recommendations for this, please let me know. Thanks for the help!