User-Agent:       Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML,
like Gecko) Chrome/125.0.0.0 Safari/537.36
Build Identifier: 

User with alternate shell (fish, zsh, etc) must install in the core via
transactional-updates, but installer rightly does not add user specified
packages from previous install to upgrade install.

If user has alternate shell specified in /etc/passwd, login is not possible.

Reproducible: Always

Steps to Reproduce:
1. Add alternate shell to core OS
2. Change user shell
3. Perform RC2 tik update
Actual Results:  
Unable to login; no root login is possible in an upgraded or fresh RC2.

Expected Results:  
At minimum, detect user shell is not a system default and warn/block the
upgrade, recommend user logon to old system, chsh, and restart upgrade.