ci: correct Github Actions CI instability for iOS. (#2337)

* Correct Github Actions CI instability for iOS.

* Add a dummy serial test so CircleCI passes serial test discovery.

bin/run_tests.py

@@ -34,15 +34,39 @@ if __name__ == "__main__":
         if args.run_podman:
             unit_test_args += ["--run-podman"]
 
+    print(
+        "\n\n================================== UNIT TESTS ==================================",
+        flush=True,
+    )
     subprocess.run(unit_test_args, check=True)
 
-    # integration tests
+    # Run the serial integration tests without multiple processes
+    serial_integration_test_args = [
+        sys.executable,
+        "-m",
+        "pytest",
+        "-m",
+        "serial",
+        "-x",
+        "--durations",
+        "0",
+        "--timeout=2400",
+        "test",
+        "-vv",
+    ]
+    print(
+        "\n\n=========================== SERIAL INTEGRATION TESTS ===========================",
+        flush=True,
+    )
+    subprocess.run(serial_integration_test_args, check=True)
+
+    # Non-serial integration tests
     integration_test_args = [
         sys.executable,
         "-m",
         "pytest",
-        "--dist",
-        "loadgroup",
+        "-m",
+        "not serial",
         f"--numprocesses={args.num_processes}",
         "-x",
         "--durations",
@@ -55,4 +79,8 @@ if __name__ == "__main__":
     if sys.platform.startswith("linux") and args.run_podman:
         integration_test_args += ["--run-podman"]
 
+    print(
+        "\n\n========================= NON-SERIAL INTEGRATION TESTS =========================",
+        flush=True,
+    )
     subprocess.run(integration_test_args, check=True)