Can we enable CI for legacy systems?

[Wowfunhappy@gmail.com]

> The rest are available at <https://developer.apple.com/download/more/>.

That link contains old versions of Xcode for me, but not old operating systems. I wonder, Joshua, do you have  a paid Apple developer account? (I do not.)

> And half the time, when I try to create a new VM using an old version's installer, the installer process tells me "This installer has been damaged" and refuses to continue.

Depending on the version of macOS, you may be able to silence that by popping into the Terminal. https://apple.stackexchange.com/questions/216730/this-copy-of-the-install-os-x-el-capitan-application-cant-be-verified-it-may-h/232016#232016
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