This fixes permission for the weldr sockets: allow users in group
`weldr` to access them, but nobody else. Also add this group to the
sysusers file.
Fixes#646
The intention is for the sockets always to stay around, even when
the service is restarted. This way the worker can always connect.
Signed-off-by: Tom Gundersen <teg@jklm.no>
osbuild-composer now uses socket activation instead of hardcoded paths
in the code. osbuild-worker is an http client therefore it uses only
service unit. osbuild-worker must be started after the socket is
created. osbuild-composer service requires osbuild-worker to run, because without
it no jobs can be started.
osbuild-composer is executed as a regular user (newly created
_osbuild-composer user) as opposed to the worker which must run as root
in order to execute osbuild itself
