ci: schedule long-running OTel conformance tests

Author: zhongkechen

.github/scripts/tests/test_opentelemetry_conformance_workflow.py

@@ -10,6 +10,8 @@
 def test_opentelemetry_conformance_caller_uses_current_workflow_contract() -> None:
     workflow = WORKFLOW_PATH.read_text()
 
+    assert '  schedule:\n    - cron: "0 7 * * *"' in workflow
+
     orchestrator = (
         "uses: aws/aws-durable-execution-conformance-tests/.github/workflows/"
         f"opentelemetry-orchestrator.yml@{ORCHESTRATOR_REVISION}"

.github/workflows/opentelemetry-conformance-tests.yml

@@ -13,6 +13,8 @@ on:
       - "packages/aws-durable-execution-sdk-python/**"
       - "packages/aws-durable-execution-sdk-python-otel/**"
       - ".github/workflows/opentelemetry-conformance-tests.yml"
+  schedule:
+    - cron: "0 7 * * *"
   workflow_dispatch:
     inputs:
       phase: