Ignore errors in test cleanup

There seems to be a race condition when running this cleanup on github
actions which results in
> FileNotFoundError: [Errno 2] No such file or directory: 'S.gpg-agent.ssh'

tests/db/test_utils.py

@@ -369,7 +369,7 @@ class TestMessageFromFile(TestCaseClassCleanup):
     @classmethod
     def setUpClass(cls):
         home = tempfile.mkdtemp()
-        cls.addClassCleanup(shutil.rmtree, home)
+        cls.addClassCleanup(lambda : shutil.rmtree(home, ignore_errors=True))
         mock_home = mock.patch.dict(os.environ, {'GNUPGHOME': home})
         mock_home.start()
         cls.addClassCleanup(mock_home.stop)