CI: Don’t skip test_run_with_user_global_config_file

Before this change one of yamllint’s tests wasn’t being run on GitHub
Actions Runners because the HOME environment variable couldn’t be
overridden. I just tested it, and it looks like the HOME variable can be
overridden now, so that test no longer needs to be skipped.

tests/test_cli.py

@@ -328,7 +328,6 @@ def test_run_with_config_file(self):
             cli.run(('-c', f.name, os.path.join(self.wd, 'a.yaml')))
         self.assertEqual(ctx.returncode, 1)
 
-    @unittest.skipIf(os.environ.get('GITHUB_RUN_ID'), '$HOME not overridable')
     def test_run_with_user_global_config_file(self):
         home = os.path.join(self.wd, 'fake-home')
         dir = os.path.join(home, '.config', 'yamllint')