tests: skip excessively flaky MPS-specific tests in CI

Author: psychedelicious

tests/backend/model_manager/load/model_cache/cached_model/utils.py

@@ -1,3 +1,5 @@
+import os
+
 import pytest
 import torch
 
@@ -19,12 +21,13 @@ def forward(self, x: torch.Tensor) -> torch.Tensor:
         x = x + self.buffer2
         return x
 
+is_github_ci = os.getenv('GITHUB_ACTIONS') == 'true'
 
 parameterize_mps_and_cuda = pytest.mark.parametrize(
     ("device"),
     [
         pytest.param(
-            "mps", marks=pytest.mark.skipif(not torch.backends.mps.is_available(), reason="MPS is not available.")
+            "mps", marks=pytest.mark.skipif(is_github_ci or not torch.backends.mps.is_available(), reason="MPS is very flaky in CI" if is_github_ci else "MPS is not available.")
         ),
         pytest.param("cuda", marks=pytest.mark.skipif(not torch.cuda.is_available(), reason="CUDA is not available.")),
     ],