bootc install to-existing-root failed on CS10 and RHEL 9.6

[henrywang]

Issue only exists on bootc-202501061944.g38e6528896-1.el10.x86_64 but not bootc-202501041456.ga408792740-1.el10.x86_64. The issue should be related with PR #1001

TASK [Install image with bootc install to-existing-root] ***********************
Tuesday 07 January 2025  04:34:14 +0000 (0:00:42.731)       0:02:10.726 ******* 
fatal: [guest]: FAILED! => changed=true 
  cmd:
  - podman
  - run
  - --rm
  - --tls-verify=false
  - --privileged
  - --pid=host
  - -v
  - /:/target
  - -v
  - /dev:/dev
  - -v
  - /var/lib/containers:/var/lib/containers
  - --security-opt
  - label=type:unconfined_t
  - 192.168.100.1:5000/hidden:3z62
  - bootc
  - install
  - to-existing-root
  delta: '0:00:24.119603'
  end: '2025-01-06 23:34:37.766259'
  msg: non-zero return code
  rc: 1
  start: '2025-01-06 23:34:13.646656'
  stderr: |-
    ----------------------------
    WARNING: This operation will OVERWRITE THE BOOTED HOST ROOT FILESYSTEM and is NOT REVERSIBLE.
    Waiting 20s to continue; interrupt (Control-C) to cancel.
    ----------------------------
    Installing to `dos` format partitions is not recommended
    [31mERROR[0m Installing to filesystem: Creating ostree deployment: loading sysroot: Not a symbolic link: boot/loader
  stderr_lines: <omitted>
  stdout: |-
    Installing image: docker://192.168.100.1:5000/hidden:3z62
    Digest: sha256:0e88d1c2a404efa6705b95b8a158931de7f3a35231084e7364a8a7b0e6159677
    Initializing ostree layout
  stdout_lines: <omitted>

[henrywang]

Verified on CS10 with bootc-202501071704.gb19e227501-1.el10.x86_64 and on RHEL 9.6 with bootc-202501071704.gb19e227501-1.el9.x86_64.