[Error] Wrong handling of exported bash functions

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Describe the bug An exported bash function appears as an environment variable with multiline value. It's incorrectly handled by distrobox, when building "--env" arguments for podman.

To Reproduce

• either
  • Use openSUSE Tumbleweed as a host OS
  • install mc
• or
  • run in bash
    bash复制

    mc()
    {
    . /usr/share/mc/mc-wrapper.sh
    }
    export -f mc

• verify result
  python复制

  $ python3
  Python 3.13.11 (main, Dec 19 2025, 18:38:03) [GCC] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  >>> import os
  >>> os.environ["BASH_FUNC_mc%%"]
  '() {  . /usr/share/mc/mc-wrapper.sh\n}'

• 复制

  #notice missing '}' at the end
  $ distrobox enter --dry-run example | grep BASH_FUNC_mc
  --env=BASH_FUNC_mc%%=() {  . /usr/share/mc/mc-wrapper.sh

• 复制

  $ distrobox enter example
  /bin/sh: mc: line 1: syntax error: unexpected end of file from `{' command on line 0
  /bin/sh: error importing function definition for `mc'
  bash: mc: line 1: syntax error: unexpected end of file from `{' command on line 0
  bash: error importing function definition for `mc'

Expected behavior It should probably just reject the env variable.

Logs I think it's not relevant here.

Desktop (please complete the following information):

• Are you using podman, docker or lilipod? podman
• Which version or podman? 5.7.1
• Which version of distrobox? 1.8.2.4
• Which host distribution? openSUSE Tumbleweed
• How did you install distrobox? from repo