`ilab` wrapper script adjustments

[omertuc]

ilab wrapper script adjustments

Ticket RHELAI-442

Background

RHEL AI ships with a script in /usr/local/bin called ilab which makes running ilab commands feel native even though they're actually running in a podman container

Issues

• The script is outdated / used several different container images for different purposes, while it should be just using the single instructlab image

• The volume mounts were incorrect, as instructlab now uses XDG paths

• Unnecessary directory creation for HF_CACHE

• Unnecessary GPU count logic

• Script has unnecessary fiddling of ilab parameters, essentially creating a UX that deviates from the natural ilab CLI

Solutions

• Changed script to use the single container image IMAGE_NAME (this was already the case mostly, except for old references to LVLM_NAME and TRAIN_NAME which no longer get replaced leading to a broken PODMAN_COMMAND_SERVE. Also adjusted entrypoint to use the ilab executable in the pyenv

• Will now mount the host's ~/.config and ~/.local into the container's corresponding directories, for instructlab to use and for its config / data to persist across invocations

• Will now mount ~/.cache into the container's corresponding .cache directory, so that the information stored in the default HF_CACHE is also persisted across invocations

• Removed unnecessary GPU count logic

• Removed all parameter parsing / fiddling

Other changes

Added secret/fake "shell" ilab subcommand which opens a shell in the wrapper's container, useful for troubleshooting issues with the wrapper itself

[n1hility]

Excellent thank you @omertuc LGTM

[n1hility]

Just need DCO