Add: Add tests for --github-pre-release flag for `pontos-release cr…

…eate`

Ensure the correct behavior of parsing the new flag.

tests/release/test_parser.py

@@ -65,6 +65,7 @@ def test_default(self):
         self.assertEqual(args.git_tag_prefix, "v")
         self.assertEqual(args.space, "greenbone")
         self.assertFalse(args.local)
+        self.assertFalse(args.github_pre_release)
 
     def test_git_remote_name(self):
         _, _, args = parse_args(
@@ -248,6 +249,13 @@ def test_update_project(self):
 
         self.assertFalse(args.update_project)
 
+    def test_github_pre_release(self):
+        _, _, args = parse_args(
+            ["create", "--release-type", "patch", "--github-pre-release"]
+        )
+
+        self.assertTrue(args.github_pre_release)
+
 
 class SignParseArgsTestCase(unittest.TestCase):
     def test_sign_func(self):