[Bug 2147921] Re: manifest can be wrong

[Skia]

Opened an MP with some part of these changes (only the use of LIVE_PASSES, not the removal of `$CASPER_DIR`):
https://code.launchpad.net/~ubuntu-core-dev/livecd-rootfs/+git/livecd-rootfs/+merge/503545

This seems to be a not too bad approach. I've verified by dumping `config/common` for a couple of projects:
```
lubuntu:PASSES="minimal minimal.standard minimal.standard.live"
lubuntu:LIVE_PASSES="minimal.standard.live"
ubuntu:PASSES="minimal minimal.de minimal.en minimal.enhanced-secureboot minimal.enhanced-secureboot.de minimal.enhanced-secureboot.en minimal.enhanced-secureboot.es minimal.enhanced-secureboot.fr minimal.enhanced-secureboot.it minimal.enhanced-secureboot.no-languages minimal.enhanced-secureboot.pt minimal.enhanced-secureboot.ru minimal.enhanced-secureboot.zh minimal.es minimal.fr minimal.it minimal.no-languages minimal.pt minimal.ru minimal.standard minimal.standard.de minimal.standard.en minimal.standard.enhanced-secureboot minimal.standard.enhanced-secureboot.de minimal.standard.enhanced-secureboot.en minimal.standard.enhanced-secureboot.es minimal.standard.enhanced-secureboot.fr minimal.standard.enhanced-secureboot.it minimal.standard.enhanced-secureboot.no-languages minimal.standard.enhanced-secureboot.pt minimal.standard.enhanced-secureboot.ru minimal.standard.enhanced-secureboot.zh minimal.standard.es minimal.standard.fr minimal.standard.it minimal.standard.live minimal.standard.no-languages minimal.standard.pt minimal.standard.ru minimal.standard.zh minimal.zh"
ubuntu:LIVE_PASSES="minimal.standard.live"
ubuntu-core-installer:PASSES="base base.live"
ubuntu-core-installer:LIVE_PASSES="base.live"
ubuntu-server:PASSES="ubuntu-server-minimal ubuntu-server-minimal.ubuntu-server ubuntu-server-minimal.ubuntu-server.installer ubuntu-server-minimal.ubuntu-server.installer.generic ubuntu-server-minimal.ubuntu-server.installer.generic.netboot"
ubuntu-server:NO_SQUASHFS_PASSES="ubuntu-server-minimal.ubuntu-server.installer.generic.netboot"
ubuntu-server:LIVE_PASSES="ubuntu-server-minimal.ubuntu-server.installer.generic"
ubuntustudio:PASSES="minimal minimal.standard minimal.standard.live"
ubuntustudio:LIVE_PASSES="minimal.standard.live"
ubuntu-test-iso:PASSES="base base.live"
ubuntu-test-iso:LIVE_PASSES="base.live"
xubuntu:PASSES="minimal minimal.standard minimal.standard.live"
xubuntu:LIVE_PASSES="minimal.standard.live"
```

Thanks for pointing me to that LIVE_PASSES variable! :-)

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https://bugs.launchpad.net/bugs/2147921

Title:
  manifest can be wrong

Status in livecd-rootfs package in Ubuntu:
  Confirmed

Bug description:
  Since this MP, the manifest produced for some ISOs is wrong.
  https://code.launchpad.net/~skia/livecd-rootfs/+git/livecd-rootfs/+merge/503356

  For example:
  build: https://launchpad.net/~ubuntu-cdimage/+livefs/ubuntu/resolute/ubuntu/+build/940399
  log: https://launchpadlibrarian.net/856172835/buildlog_ubuntu_resolute_amd64_ubuntu_BUILDING.txt.gz

  This is an Ubuntu Desktop build from 20260410, and we can see the many layers produced (search for `Delta manifest` in the build log).
  The one surfaced in the artifacts is the very last one, due to the logic implemented in the MP above, and that means the `zh` layer:
  ```
  Delta manifest:
  --- /build/config/iso-dir/iso-root/casper/minimal.manifest.full	2026-04-10 06:21:52.870807314 +0000
  +++ /build/config/iso-dir/iso-root/casper/minimal.zh.manifest.full	2026-04-10 06:48:36.145883155 +0000
  ```
  This is obviously not correct, but also, what should be the correct behavior? What layer is "the right one", in a kinda generic way?

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