[ci] skip Dask tests on QEMU builds (#4600)

tests/python_package_test/test_dask.py

@@ -7,6 +7,7 @@ import random
 import socket
 from itertools import groupby
 from os import getenv
+from platform import machine
 from sys import platform
 
 import pytest
@@ -15,6 +16,8 @@ import lightgbm as lgb
 
 if not platform.startswith('linux'):
     pytest.skip('lightgbm.dask is currently supported in Linux environments', allow_module_level=True)
+if machine() != 'x86_64':
+    pytest.skip('lightgbm.dask tests are currently skipped on some architectures like arm64', allow_module_level=True)
 if not lgb.compat.DASK_INSTALLED:
     pytest.skip('Dask is not installed', allow_module_level=True)