Stuck installing guix package manager on Fedora with selinux

[Alexis Simon <alexis.simon@runbox.com>]

Hi,

I'd like to try the guix package manager but am stuck installing it on 
Fedora 38 with selinux. I should say I don't know anything about the 
details of either guix or selinux.
I know a few other persons that also wanted to try guix but gave up due 
to issues with selinux, so I think solving this issue could help in 
adoption.

I've used the installer script which worked well, then was initially hit 
by this error
`guix install: error: remounting /gnu/store writable: Permission denied`

This was solved by doing
sudo semodule -i 
/gnu/store/5kj8lyybjrdl7xd0fx9g9vzkz8sklqsy-guix-1.4.0/share/selinux/guix-daemon.cil 

sudo mount -o remount,rw /gnu/store
sudo restorecon -R /gnu /var/guix
sudo systemctl restart guix-daemon.service

(note that the mount step was the missing part that was missing from all 
guides I've seen on the web, and I found it in a guix commit).

Now I have a different issue, guix-daemon doesn't seem to be able to 
access internet with errors of the type
`In procedure getaddrinfo: Temporary failure in name resolution`
(disabling selinux works in that case, but I want it enabled)

This is what I get from setroubleshoot:
```
SELinux is preventing guix substitute from search access on the 
directory systemd.
*****  Plugin catchall (100. confidence) suggests   *****
*********************
If you believe that guix substitute should be allowed sea
rch access on the systemd directory by default.
Then you should report this as a bug.
You can generate a local policy module to allow this acce
ss.
Do
allow this access for now by executing:
# ausearch -c 'guix substitute' --raw | audit2allow -M my
-guixsubstitute
# semodule -X 300 -i my-guixsubstitute.pp
```

Trying the suggested commands also errors in:
```
libsepol.hierarchy_add_type_callback: guix_daemon doesn't exist, 
guix_daemon.guix_daemon_t is an orphan
libsepol.hierarchy_add_bounds: 1 errors found while adding hierarchies
```

So I don't really know where to go from there, any help appreciated.
Thanks
Alexis