[export ADDGROUP_GID=<number>]
[export ADDGROUP_GIDFORCE=<number>]
[export ADDGROUP_NAME=<string>]
require addgroup [groupname]
Ensure that named group existsin a system. Either environment variable
ADDGROUP_NAME or an argument groupname must be prvovided.
If ADDGROUP_GIDFORCE is provided, module fails if group already exists
with different gid.
If ADDGROUP_GID is set, creation of the group prefers this gid for
the newly created group. If unset, defaults to ADDGROUP_GIDFORCE.
Obsolete GROUP_GID and GROUP_NAME are defaults accepted at least until
end of 2023 and will be removed afterwards.