Default docker run doesn't work even if default SEQREPO_ROOT_DIR is populated

[theferrit32]

Describe the bug

To Reproduce
Steps to reproduce the behavior:

I have a directory $HOME/dev/data/seqrepo with a populated and working SeqRepo database.

Pull image:

podman pull biocommons/seqrepo-rest-service

Run container:

$ podman run --rm --name seqrepo-rest \
  -v $HOME/dev/data/seqrepo:/usr/local/share/seqrepo \
  -p 5001:5000 \
  biocommons/seqrepo-rest-service

Output:

usage: seqrepo-rest-service [-h] [--wait-for-path] SEQREPO_INSTANCE_DIR
seqrepo-rest-service: error: the following arguments are required: SEQREPO_INSTANCE_DIR

Expected behavior
It would be nice if it just ran using the same default dir as SeqRepo itself. And detected that a snapshot was already there.