system-wide additionalimagestores ignored on Fedora 40

[NickJLange]

Issue Description

I have been unable to successfully follow the guide for setting up a read-only image store as described here:
https://www.redhat.com/sysadmin/image-stores-podman

Similar to #1827 , I'd like to have a system-wide local image "caching layer" of regularly updated common images for our users so they don't hit the network. I'll split the force-mask shared value is ignored into a separate issue.

Steps to reproduce the issue

• create /etc/containers/storage.conf in line with article
  • NB: additional fields like runroot/graphroot are required since this article was written
• as Repository ID Pull down images with the --root flag as described here.
• Test visibility as root - additional images listed
• Test visibility as another user - additional images not listed

Steps to workaround the issue
Create $HOME/.config/containers/storage.conf with said values, and it will be picked up

** podman info**

njl@fedora:~/.config/containers$ podman info
host:
  arch: arm64
  buildahVersion: 1.35.1
  cgroupControllers:
  - cpu
  - io
  - memory
  - pids
  cgroupManager: systemd
  cgroupVersion: v2
  conmon:
    package: conmon-2.1.10-1.fc40.aarch64
    path: /usr/bin/conmon
    version: 'conmon version 2.1.10, commit: '
  cpuUtilization:
    idlePercent: 99.85
    systemPercent: 0.1
    userPercent: 0.05
  cpus: 8
  databaseBackend: sqlite
  distribution:
    distribution: fedora
    variant: workstation
    version: "40"
  eventLogger: journald
  freeLocks: 2048
  hostname: fedora
  idMappings:
    gidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 524288
      size: 65536
    uidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 524288
      size: 65536
  kernel: 6.8.5-301.fc40.aarch64
  linkmode: dynamic
  logDriver: journald
  memFree: 431079424
  memTotal: 4084609024
  networkBackend: netavark
  networkBackendInfo:
    backend: netavark
    dns:
      package: aardvark-dns-1.10.0-1.fc40.aarch64
      path: /usr/libexec/podman/aardvark-dns
      version: aardvark-dns 1.10.0
    package: netavark-1.10.3-3.fc40.aarch64
    path: /usr/libexec/podman/netavark
    version: netavark 1.10.3
  ociRuntime:
    name: crun
    package: crun-1.14.4-1.fc40.aarch64
    path: /usr/bin/crun
    version: |-
      crun version 1.14.4
      commit: a220ca661ce078f2c37b38c92e66cf66c012d9c1
      rundir: /run/user/1000/crun
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +LIBKRUN +WASM:wasmedge +YAJL
  os: linux
  pasta:
    executable: /usr/bin/pasta
    package: passt-0^20240326.g4988e2b-1.fc40.aarch64
    version: |
      pasta 0^20240326.g4988e2b-1.fc40.aarch64-pasta
      Copyright Red Hat
      GNU General Public License, version 2 or later
        <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
      This is free software: you are free to change and redistribute it.
      There is NO WARRANTY, to the extent permitted by law.
  remoteSocket:
    exists: false
    path: /run/user/1000/podman/podman.sock
  security:
    apparmorEnabled: false
    capabilities: CAP_CHOWN,CAP_DAC_OVERRIDE,CAP_FOWNER,CAP_FSETID,CAP_KILL,CAP_NET_BIND_SERVICE,CAP_SETFCAP,CAP_SETGID,CAP_SETPCAP,CAP_SETUID,CAP_SYS_CHROOT
    rootless: true
    seccompEnabled: true
    seccompProfilePath: /usr/share/containers/seccomp.json
    selinuxEnabled: true
  serviceIsRemote: false
  slirp4netns:
    executable: ""
    package: ""
    version: ""
  swapFree: 4078956544
  swapTotal: 4084199424
  uptime: 10h 8m 29.00s (Approximately 0.42 days)
  variant: v8
plugins:
  authorization: null
  log:
  - k8s-file
  - none
  - passthrough
  - journald
  network:
  - bridge
  - macvlan
  - ipvlan
  volume:
  - local
registries:
  search:
  - registry.fedoraproject.org
  - registry.access.redhat.com
  - docker.io
  - quay.io
store:
  configFile: /home/njl/.config/containers/storage.conf
  containerStore:
    number: 0
    paused: 0
    running: 0
    stopped: 0
  graphDriverName: overlay
  graphOptions:
    overlay.imagestore: /d/d1/ociro/containers
    overlay.mount_program:
      Executable: /usr/bin/fuse-overlayfs
      Package: fuse-overlayfs-1.13-1.fc40.aarch64
      Version: |-
        fusermount3 version: 3.16.2
        fuse-overlayfs: version 1.13-dev
        FUSE library version 3.16.2
        using FUSE kernel interface version 7.38
  graphRoot: /home/njl/.local/share/containers/storage
  graphRootAllocated: 30508318720
  graphRootUsed: 6069903360
  graphStatus:
    Backing Filesystem: btrfs
    Native Overlay Diff: "false"
    Supports d_type: "true"
    Supports shifting: "true"
    Supports volatile: "true"
    Using metacopy: "false"
  imageCopyTmpDir: /var/tmp
  imageStore:
    number: 1
  runRoot: /run/user/1000/containers
  transientStore: false
  volumePath: /home/njl/.local/share/containers/storage/volumes
version:
  APIVersion: 5.0.0
  Built: 1710806400
  BuiltTime: Mon Mar 18 20:00:00 2024
  GitCommit: ""
  GoVersion: go1.22.0
  Os: linux
  OsArch: linux/arm64
  Version: 5.0.0