test: '{. -> ./mod}/test_util_selinux.py'

Move the 'test_util_selinux.py' test into the module-unittest
subdirectory.

Drop the '__main__' hookup while at it. `python -m unittest --help`
explains how you can run individual tests.

.github/workflows/tests.yml

@@ -87,11 +87,6 @@ jobs:
           cd osbuild
           python3 -m unittest -v test.test_util_ostree
 
-      - name: Run test_util_selinux
-        run: |
-          cd osbuild
-          python3 -m unittest -v test.test_util_selinux
-
   rpm_build:
     name: "📦 RPM"
     runs-on: ubuntu-latest

test/mod/__init__.py

@@ -0,0 +1 @@
+# The `unittest` module requires `__init__.py` to discover a directory.

test/mod/test_util_selinux.py

@@ -1,3 +1,7 @@
+#
+# Tests for the 'osbuild.util.selinux' module.
+#
+
 import io
 import unittest
 
@@ -36,7 +40,3 @@ class TestObjectStore(unittest.TestCase):
 
         policy = selinux.config_get_policy(cfg)
         self.assertEqual(policy, 'targeted')
-
-
-if __name__ == "__main__":
-    unittest.main()