dvc.run does not expand variables. It is only done when it's actually read from dvc.yaml file.
So during dvc run, the shell will try to expand the variable, which does not exist.
I don't think that the intention was to use shell variables. But I don't think we should ever
use them, as they will fail on some shells (eg: fish) and keep the scripts as simple as possible.
Closes#9058 .
Ensures behavior of `_stash_exp` in `exp run` is matched in `exp save` without duplicating logic.
The simpler implementation ended up being worse for maintenance when wanting to make `exp run` and `exp save` behavior in sync.
Allow to include a list of potentially untracked files.
Covers the DVCLive use case where in the first run the generated files won't be tracked in Git yet.
David de la Iglesia Castro
Saugat Pachhai (सौगात)
skshetry
dberenbaum
Daniele Trifirò