project: disable auto-gc for depth=1 in git config

During sync, `git checkout` can trigger fetch for missing objects in
partial clones. This internal fetch can trigger `git maintenance` or
`git gc` and cause delays during the local checkout phase. Set
maintenance.auto to false and gc.auto to 0 in during `_InitRemote` if
`depth=1` to ensure that implicit fetches spawned by git skip GC.

Bug: 379111283
Change-Id: I6b22a4867f29b6e9598746cb752820a84dc2aeb6
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/540681
Reviewed-by: Mike Frysinger <vapier@google.com>
Tested-by: Gavin Mak <gavinmak@google.com>
Commit-Queue: Gavin Mak <gavinmak@google.com>

tests/test_git_config.py

@@ -166,6 +166,30 @@ class GitConfigReadWriteTests(unittest.TestCase):
         config = self.get_config()
         self.assertIsNone(config.GetBoolean("foo.bar"))
 
+    def test_SetInt(self):
+        """Test SetInt behavior."""
+        # Set a value.
+        self.assertIsNone(self.config.GetInt("foo.bar"))
+        self.config.SetInt("foo.bar", 10)
+        self.assertEqual(10, self.config.GetInt("foo.bar"))
+
+        # Make sure the value was actually written out.
+        config = self.get_config()
+        self.assertEqual(10, config.GetInt("foo.bar"))
+        self.assertEqual("10", config.GetString("foo.bar"))
+
+        # Update the value.
+        self.config.SetInt("foo.bar", 20)
+        self.assertEqual(20, self.config.GetInt("foo.bar"))
+        config = self.get_config()
+        self.assertEqual(20, config.GetInt("foo.bar"))
+
+        # Delete the value.
+        self.config.SetInt("foo.bar", None)
+        self.assertIsNone(self.config.GetInt("foo.bar"))
+        config = self.get_config()
+        self.assertIsNone(config.GetInt("foo.bar"))
+
     def test_GetSyncAnalysisStateData(self):
         """Test config entries with a sync state analysis data."""
         superproject_logging_data = {}