Fix collector output permissions in CI

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: b872ac61-5bac-40e3-b9c7-daf295725fde

Author: andystaples

tests/azure-functions-durable/e2e/_harness.py

@@ -115,6 +115,10 @@ def start(self) -> None:
             raise RuntimeError("Docker is required for the tracing E2E test.")
 
         self.work_dir.mkdir(parents=True, exist_ok=True)
+        if os.name != "nt":
+            # The collector image runs as UID/GID 10001, while pytest creates
+            # temporary directories as owner-only on Linux.
+            self.work_dir.chmod(0o777)
         self.config_path.write_text(
             "receivers:\n"
             "  otlp:\n"
@@ -196,6 +200,19 @@ def get_spans(self) -> list[dict[str, Any]]:
                         spans.append({**span, "scopeName": scope_name})
         return spans
 
+    def get_logs(self) -> str:
+        """Return collector container logs for assertion diagnostics."""
+        docker = shutil.which("docker")
+        if docker is None:
+            return "Docker is not available."
+        result = subprocess.run(
+            [docker, "logs", self.container_name],
+            capture_output=True,
+            check=False,
+            text=True,
+        )
+        return result.stdout + result.stderr
+
 
 @dataclass
 class HttpResult:

tests/azure-functions-durable/e2e/test_distributed_tracing_e2e.py

@@ -49,7 +49,7 @@ def test_user_span_correlates_to_host_without_worker_lifecycle_duplicates(
                 break
         time.sleep(0.5)
 
-    assert len(user_spans) == 1
+    assert len(user_spans) == 1, collector.get_logs()
     user_span = user_spans[0]
     summary = [
         (