Usermod causes failed to open secrets.tdb due to missing directory

[JessicaMulein]

I get: "Failed to open /var/lib/samba/private/secrets.tdb"
when trying to do usermod add. I see that ./var/lib/samba exists but not ./var/lib/samba/private. Making that directory first seems to work. Suggest touching a .empty file in that dir and adding it to git?

Also, your readme.md says samba-docker, but the command is docker-samba.