-m docker doesn't seem to use Docker

[itamarst]

Docker mode doesn't seem to work; this is Linux, Fedora 33, with conda-lock 0.7.2.

$ conda-lock -p linux-64 -m docker &
[1] 172664
$ generating lockfile for linux-64

$ docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
$ docker ps -a
# ... a bunch of dead containers, but none from today ...