[BUG] test_pkgrepo not run on Debian

Description

The tests in tests/pytests/functional/states/test_pkgrepo.py should be run on Debian based systems:

@pytest.mark.skipif(
    not any([x for x in ["ubuntu", "debian"] if x in platform.platform()]),
    reason="Test only for debian based platforms",
)

But on Ubuntu 21.10, platform.platform() does not return the distribution name:

$ python3 -c "import platform; print(platform.platform())"
Linux-5.13.0-28-generic-x86_64-with-glibc2.34

Note 1

Once https://github.com/saltstack/salt/pull/61626 is reviewed and merged, following code could be used to run the test cases on all Debian based systems (not only on Debian and Ubuntu):

from salt.grains.core import freedesktop_os_release, _family_id

def is_debian_based():
    os_release = freedesktop_os_release()
    return _family_id(os_release["ID"], os_release.get["ID_LIKE"]) == "debian"

@pytest.mark.skipif(
    not is_debian_based(),
    reason="Test only for debian based platforms",
)

Note 2

If I remove the skipif, these test cases fail to run during Debian package build, because they want to write to /etc/apt/sources.list:

____________________________ test_adding_repo_file _____________________________

states = <LazyLoader module='salt.loaded.states'>
tmp_path = PosixPath('/tmp/pytest-of-bdrung/pytest-0/test_adding_repo_file0')

    def test_adding_repo_file(states, tmp_path):
        """
        test adding a repo file using pkgrepo.managed
        """
        repo_file = str(tmp_path / "stable-binary.list")
        repo_content = "deb http://www.deb-multimedia.org stable main"
        ret = states.pkgrepo.managed(name=repo_content, file=repo_file, clean_file=True)
        with salt.utils.files.fopen(repo_file, "r") as fp:
            file_content = fp.read()
>       assert file_content.strip() == repo_content
E       AssertionError: assert '' == 'deb http://w...g stable main'
E         - deb http://www.deb-multimedia.org stable main

tests/pytests/functional/states/test_pkgrepo.py:16: AssertionError
------------------------------ Captured log setup ------------------------------
ERROR    salt.utils.event:event.py:426 Unable to connect pusher: Stream is closed
Traceback (most recent call last):
  File "/<<PKGBUILDDIR>>/salt/utils/event.py", line 423, in connect_pull
    self.pusher.connect(timeout=timeout)
  File "/<<PKGBUILDDIR>>/salt/utils/asynchronous.py", line 125, in wrap
    raise exc_info[1].with_traceback(exc_info[2])
  File "/<<PKGBUILDDIR>>/salt/utils/asynchronous.py", line 131, in _target
    result = io_loop.run_sync(lambda: getattr(self.obj, key)(*args, **kwargs))
  File "/<<PKGBUILDDIR>>/salt/ext/tornado/ioloop.py", line 459, in run_sync
    return future_cell[0].result()
  File "/<<PKGBUILDDIR>>/salt/ext/tornado/concurrent.py", line 249, in result
    raise_exc_info(self._exc_info)
  File "<string>", line 4, in raise_exc_info
  File "/<<PKGBUILDDIR>>/salt/transport/ipc.py", line 342, in _connect
    yield self.stream.connect(sock_addr)
  File "/<<PKGBUILDDIR>>/salt/ext/tornado/gen.py", line 1056, in run
    value = future.result()
  File "/<<PKGBUILDDIR>>/salt/ext/tornado/concurrent.py", line 249, in result
    raise_exc_info(self._exc_info)
  File "<string>", line 4, in raise_exc_info
salt.ext.tornado.iostream.StreamClosedError: Stream is closed
------------------------------ Captured log call -------------------------------
ERROR    salt.state:state.py:317 Failed to configure repo 'deb http://www.deb-multimedia.org stable main': [Errno 13] Permission denied: '/etc/apt/sources.list'

Versions Report

salt 3004, but the master branch is affected as well.

Start with tests/pytests/functional/states/test_pkgrepo.py and inspect its platform-based skip condition. Review the referenced freedesktop_os_release and _family_id helpers, then run the test in the Debian-based environments described by the issue. Done means the tests are selected on Debian-based systems without requiring unauthorized writes to /etc/apt/sources.list.