To Reproduce Steps to reproduce the behavior:

1. Run a diip CI job that uses tmux sessions and sets HOME=
2. While the job is running open a tmux window on the host machine
3. Any tmux sessions started while the above window will ignore the HOME env variable

Expected behavior

• HOME should be respected

Bug impact

• CI jobs running inconsistently when tmux is already running on the Host

Known workaround

• Close all tmux sessions 

More info
When instructlab_home_dir is configured in RhelAIBootcContainer, the HOME environment variable is not consistently set for tmux sessions created via exec_command_with_tmux. This occurs because:

1. 1. RhelAIBootcContainer.exec_command overrides the base method to prepend HOME={self.home_dir} && to all commands when instructlab_home_dir is configured
   2. tmux server only inherits environment variables when it is first started
   3. If a tmux server is already running from a previous session, subsequent tmux new-session commands ignore the HOME environment variable set by the command prefix
   4. This leads to inconsistent behavior where HOME is only set correctly if no previous tmux session was running