15* jails to build base packages (was: FreeBSD 15.0-ALPHA1 Now Available)

If I'm not mistaken: when the 15.0-ALPHA1 installer uses base packages 
from FreeBSD Project-provided repos, the result is inferior 
15.0-PRERELEASE, for which there is (still) a 
`FreeBSD-kernel-generic-nodebug` package, and so on.

Seeking 15 at <https://pkg-status.freebsd.org/builds?type=package> finds 
no jail name that begins with 15.

Do we need additional builders, for alphas, betas, and release candidates?

Maybe already work in progress; Colin's hope of "soon" at 
<https://www.reddit.com/r/freebsd/comments/1naxy9v/comment/nd1dfui/> 
with regard to pkgbase packages shipping on the install images.

----

Thanks to /u/pavetheway91 at 
<https://www.reddit.com/r/freebsd/comments/1naxy9v/comment/nd4z750/> for 
a related catch. (Someone else might have expressed things in a 
different way. The penny didn't drop, for me, until this morning.)