Dear Guixers,

I'm sending a patchset adding rootless Podman support to the Guix 
System. I'm currently using this on my systems as it's set up in my 
personal channel [0]. By adding the following to my own system config

(use-modules (small-guix system accounts)
              (small-guix services containers))

(service iptables-service-type)
(service rootless-podman-service-type
          (rootless-podman-configuration
           (subgids
            (list (subid-range (name "alice"))))
           (subuids
            (list (subid-range (name "alice"))))))

I'm able to run the following rootless Podman hello world

$ podman run -it --rm docker.io/alpine cat /etc/*release*
NAME="Alpine Linux"
ID=alpine
VERSION_ID=3.20.2
PRETTY_NAME="Alpine Linux v3.20"
HOME_URL="https://alpinelinux.org/"
BUG_REPORT_URL="https://gitlab.alpinelinux.org/alpine/aports/-/issues"

and with guix shell podman compose I'm able to run this Podman compose 
hello world [1]:

$ mkdir data
$ echo hello world > data/index.html
$ podman compose up -d

...

exit code: 0
$ curl localhost:8080
hello world


This patch depends on the subids-service-type from issue #72337 [2]. 
Please let me know your thoughts.

Thank you for your work,

giacomo


[0]: 
https://gitlab.com/orang3/small-guix/-/blob/master/small-guix/services/containers.scm?ref_type=heads#L197
[1]: 
https://github.com/fishinthecalculator/rootless-podman-nginx-static-server
[2]: https://issues.guix.gnu.org/72337