pkgbase upgrade from 14.3-RELEASE-p6 to 15.0-RELEASE

From: Darren Henderson <darren.henderson_at_gmail.com>
Date: Tue, 02 Dec 2025 14:53:05 UTC 
I'm missing something...

On a basified 14.3-RELEASE-p6 system  I end up seeing a pkg error relating
to not being able to find a trusted key but the needed keys are there and
readable. This is pointing at base_relase_0 (and maybe that's the problem?
Do we start counting at 0 for the initial release?) using an ABI of
FreeBSD:15:amd64

The problem appears to be related to an issue evident on pkg.frrebsd.org.
If you go to https://pkg.freebsd.org/, click on FreeBSD:15:amd64 and then
click on base_release_0 you get an error message of "AccessDenied". Also a
message about XML file does not appear to have style information. The same
happens if you look under FreeBSD:15:aarch64. Again maybe that is because
15-RELEASE-p0 doesn't exist yet?

I can move from 14.3-RELEASE-p6 to 15.0-STABLE just fine if I use  url:
"pkg+https://pkg.FreeBSD.org/${ABI}/base_latest" but I'm not seeing how to
get from 14.3-RELEASE-p6 to 15-RELEASE.

Apologies if I'm missing something basic here.

-Darren