podman-kube-play not fully consistent with config file

[AliveDevil]

Using the sample for environment variables provided here¹, I expect to see the described output.

apiVersion: v1
kind: Pod
metadata:
  name: print-greeting
spec:
  containers:
  - name: env-print-demo
    image: bash
    env:
    - name: GREETING
      value: "Warm greetings to"
    - name: HONORIFIC
      value: "The Most Honorable"
    - name: NAME
      value: "Kubernetes"
    command: ["echo"]
    args: ["$(GREETING) $(HONORIFIC) $(NAME)"]

But, observing the pod log of print-greeting I see following printed:

$(GREETING) $(HONORIFIC) $(NAME)

Why is podman-kube-play not supporting this environment variable substitution?

podman info

host:
  arch: amd64
  buildahVersion: 1.29.0
  cgroupControllers:
  - cpuset
  - cpu
  - io
  - memory
  - hugetlb
  - pids
  - rdma
  - misc
  cgroupManager: systemd
  cgroupVersion: v2
  conmon:
    package: conmon-2.1.7-1.el9_2.x86_64
    path: /usr/bin/conmon
    version: 'conmon version 2.1.7, commit: fab2fef7227d2dc16478d29f1185953f81451702'
  cpuUtilization:
    idlePercent: 98.11
    systemPercent: 0.26
    userPercent: 1.64
  cpus: 4
  distribution:
    distribution: '"almalinux"'
    version: "9.2"
  eventLogger: journald
  hostname: dhcp-dns
  idMappings:
    gidmap: null
    uidmap: null
  kernel: 5.14.0-284.11.1.el9_2.x86_64
  linkmode: dynamic
  logDriver: journald
  memFree: 107134976
  memTotal: 1265946624
  networkBackend: netavark
  ociRuntime:
    name: crun
    package: crun-1.8.4-1.el9_2.x86_64
    path: /usr/bin/crun
    version: |-
      crun version 1.8.4
      commit: 5a8fa99a5e41facba2eda4af12fa26313918805b
      rundir: /run/user/0/crun
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +YAJL
  os: linux
  remoteSocket:
    exists: true
    path: /run/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: false
    seccompEnabled: true
    seccompProfilePath: /usr/share/containers/seccomp.json
    selinuxEnabled: false
  serviceIsRemote: false
  slirp4netns:
    executable: /usr/bin/slirp4netns
    package: slirp4netns-1.2.0-3.el9.x86_64
    version: |-
      slirp4netns version 1.2.0
      commit: 656041d45cfca7a4176f6b7eed9e4fe6c11e8383
      libslirp: 4.4.0
      SLIRP_CONFIG_VERSION_MAX: 3
      libseccomp: 2.5.2
  swapFree: 0
  swapTotal: 0
  uptime: 12h 38m 49.00s (Approximately 0.50 days)
plugins:
  authorization: null
  log:
  - k8s-file
  - none
  - passthrough
  - journald
  network:
  - bridge
  - macvlan
  volume:
  - local
registries:
  search:
  - registry.access.redhat.com
  - registry.redhat.io
  - docker.io
store:
  configFile: /etc/containers/storage.conf
  containerStore:
    number: 8
    paused: 0
    running: 8
    stopped: 0
  graphDriverName: overlay
  graphOptions:
    overlay.mountopt: nodev,metacopy=on
  graphRoot: /var/lib/containers/storage
  graphRootAllocated: 9989783552
  graphRootUsed: 4076216320
  graphStatus:
    Backing Filesystem: xfs
    Native Overlay Diff: "false"
    Supports d_type: "true"
    Using metacopy: "true"
  imageCopyTmpDir: /var/tmp
  imageStore:
    number: 11
  runRoot: /run/containers/storage
  transientStore: false
  volumePath: /var/lib/containers/storage/volumes
version:
  APIVersion: 4.4.1
  Built: 1683706293
  BuiltTime: Wed May 10 08:11:33 2023
  GitCommit: ""
  GoVersion: go1.19.6
  Os: linux
  OsArch: linux/amd64
  Version: 4.4.1

Footnotes

1. Define Environment Variables for a Container ↩

[Luap99]

It is not implemented (yet), see #15983

[AliveDevil]

Ah thanks, didn't see that.