Add test to validate availability of nogroup/nobody

[dirkmueller]

No description provided.

[grisu48]

CI is failing for 15.7:

=================================== FAILURES ===================================
_ test_group_nobody_working[bci/bci-base:15.7 from registry.opensuse.org/devel/bci/sle-15-sp7/images/bci/bci-base:15.7] _
[gw0] linux -- Python 3.12.8 /home/runner/work/BCI-tests/BCI-tests/.tox/base/bin/python

auto_container = ContainerData(image_url_or_id='registry.opensuse.org/devel/bci/sle-15-sp7/images/bci/bci-base:15.7', container_id='1b7...tainerfile='', image_format=None, add_build_tags=[]), forwarded_ports=[], _container_runtime=DockerRuntime(marks=None))

    @pytest.mark.skipif(
        OS_VERSION in ("15.3", "15.4", "15.5"),
        reason="unfixed in LTSS codestreams",
    )
    def test_group_nobody_working(auto_container):
        """Test that nobody group is available in the container (bsc#1212118)."""
>       assert auto_container.connection.check_output("getent group nobody")
E       AssertionError: Unexpected exit code 2 for CommandResult(backend=<testinfra.backend.docker.DockerBackend object at 0x7f26b3b7b350>, exit_status=2, command=b'getent group nobody', _stdout=b'', _stderr=b'')
E       assert 2 == 0
E        +  where 2 = CommandResult(backend=<testinfra.backend.docker.DockerBackend object at 0x7f26b3b7b350>, exit_status=2, command=b'getent group nobody', _stdout=b'', _stderr=b'').rc

tests/test_base.py:61: AssertionError

[dirkmueller]

CI is failing for 15.7:

Yes, 15.7 containers have to go through 15.7 development, that will take quite a bit of more time..