Cannot run Docker container

[Caleb Herbert]

Hi Guix,

I can't get a Docker container to work.  I'm trying to use the program
Thumbsup, which is a lousy JavaScript program.  I wrote a wrapper script
to run the container.

```
#!/usr/bin/env -S guile --no-auto-compile -e main -s # -*- Scheme -*-
!#
;; thumbsup - Run Thumbsup from container
(define (main args)
  (system
   (string-append "docker run " "-t "
                  "-v " (getcwd) ":/work "
                  "-u " (number->string (group:gid (getpw (getlogin)))) ":"
                  (group:name (getpw (getlogin)))
                  " ghcr.io/thumbsup/thumbsup "
                  "thumbsup --input /work --output /work/gallery")))
```

Docker complains about the group name.  I've tried it with both "caleb"
and "docker" with no differing results.

```
caleb@miller ~/Camera❄️ thumbsup 
docker: Error response from daemon: unable to find group caleb: no matching 
entries in group file.
```

I've tried replacing the group with `docker` as the group is associated
with my user in the system configuration.  I have the Docker service
added, too.  It should work, right?

```
(use-service-modules ... docker)

(operating-system
  ...
  (users (cons* (user-account
                  ...
                  (supplementary-groups '("wheel" ... "docker")))
                ...
                %base-user-accounts))
  ...
  (services
   (append (list
            ;; Run containers
            (service docker-service-type)
            ...
           %desktop-services))
...)
```

Tell me if you need more info.

Thanks,

-- 
Caleb Herbert
https://bluehome.net/csh/
OpenPGP fingerprint: 631C C434 A56B 5CBD FF21  2346 9764 3795 FA3E 4BCE
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