Fix RetryPolicy.from_proto() pickle error with non_retryable_error_types (#1354)

* Fix RetryPolicy.from_proto() pickle error with non_retryable_error_types

Convert protobuf RepeatedScalarContainer to Python list to make
RetryPolicy objects picklable when non_retryable_error_types is set.
This fixes crashes in sync activities using ProcessPoolExecutor.

Fixes #1350

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Fix linting errors

Fix import formatting and code formatting issues in tests/test_common.py

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* Extend latest deps timeout

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: tconley1428

.github/workflows/ci.yml

@@ -159,7 +159,7 @@ jobs:
       - run: poe lint
       - run: mkdir junit-xml
       - run: poe test  -s --junit-xml=junit-xml/latest-deps.xml
-        timeout-minutes: 10
+        timeout-minutes: 15
       - name: "Upload junit-xml artifacts"
         uses: actions/upload-artifact@v4
         if: always()

temporalio/common.py

@@ -69,7 +69,7 @@ def from_proto(proto: temporalio.api.common.v1.RetryPolicy) -> RetryPolicy:
             if proto.HasField("maximum_interval")
             else None,
             maximum_attempts=proto.maximum_attempts,
-            non_retryable_error_types=proto.non_retryable_error_types
+            non_retryable_error_types=list(proto.non_retryable_error_types)
             if proto.non_retryable_error_types
             else None,
         )

tests/test_common.py

@@ -8,6 +8,7 @@
 import pytest
 
 from temporalio.api.common.v1 import Payload
+from temporalio.api.common.v1 import RetryPolicy as RetryPolicyProto
 from temporalio.common import (
     Priority,
     RawValue,
@@ -123,3 +124,26 @@ def test_cant_construct_bad_priority():
         Priority(priority_key=1.1)  # type: ignore
     with pytest.raises(ValueError):
         Priority(priority_key=-1)
+
+
+def test_retry_policy_from_proto_pickle():
+    """Test that RetryPolicy.from_proto() creates a picklable object when non_retryable_error_types is set."""
+    # Create a protobuf with non_retryable_error_types
+    proto = RetryPolicyProto()
+    proto.initial_interval.seconds = 1
+    proto.backoff_coefficient = 2.0
+    proto.maximum_attempts = 3
+    proto.non_retryable_error_types.extend(["SomeError", "AnotherError"])
+
+    # Convert from proto
+    retry_policy = RetryPolicy.from_proto(proto)
+
+    # This should not raise a PickleError
+    pickled = pickle.dumps(retry_policy)
+    unpickled = pickle.loads(pickled)
+
+    # Verify the data is intact
+    assert unpickled.initial_interval == timedelta(seconds=1)
+    assert unpickled.backoff_coefficient == 2.0
+    assert unpickled.maximum_attempts == 3
+    assert unpickled.non_retryable_error_types == ["SomeError", "AnotherError"]