Have --container-mounts default to $PWD in #SBATCH header

[cponder]

My most common interactive command-line with Pyxis is

srun --container-image $IMAGE --container-mounts $PWD --container-workdir $PWD ...

I really appreciate that I can compact the Pyxis into the job-control header these days

#SBATCH --container-image 'nvcr.io/nvidia/ai-workbench/python-cuda122:1.0.6'

instead of having to junk-up the code with an additional call-chain layer.
But this form

#SBATCH --container-mounts $PWD

doesn't work (and I wouldn't expect it to)

sbatch: error: pyxis: mount source must be a relative path, an absolute path, "tmpfs" or "umount"
sbatch: error: pyxis: could not add mount entry: $PWD:$PWD
sbatch: error: Invalid --container-mounts argument: $PWD

and neither does this one:

#SBATCH --container-mounts .

which fails less directly:

slurmstepd: error: pyxis: container start failed with error code: 1
slurmstepd: error: pyxis: printing enroot log file:
slurmstepd: error: pyxis:     enroot-switchroot: failed to execute: /bin/sh: No such file or directory
slurmstepd: error: pyxis: couldn't start container
slurmstepd: error: spank: required plugin spank_pyxis.so: task_init() failed with rc=-1
slurmstepd: error: Failed to invoke spank plugin stack

It'd be unfortunate to have to hard-code the local path into these kinds of scripts.
Could you make either of these forms

#SBATCH --container-mounts
#SBATCH --container-mounts .

translate to using the local directory?