The FreeBSD-base repository (aka "pkgbase") is now created using 'pkg
repo -l' in order to make 'pkg rwhich' work. Unfortunately this makes
the data.pkg file considerably larger, and FreeBSD 15.2-BETA1 fails to
install using a remote repository since the installer has a small /tmp
(20 MB).

Run pkg commands with 'env TMPDIR=<chrootdir>/tmp' since the /tmp in
the system being installed is considerably larger than the tmpfs which
the installer runs with.

MFC after: 1 day