Add method for updating initramfs accordingly to OS version

Signed-off-by: Katarzyna Treder <katarzyna.treder@h-partners.com>

test_tools/initramfs.py

@@ -0,0 +1,19 @@
+#
+# Copyright(c) 2024 Huawei Technologies Co., Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+from core.test_run import TestRun
+from test_utils.os_utils import get_distro, Distro
+
+
+def update():
+    distro = get_distro()
+    TestRun.LOGGER.info("Updating initramfs")
+    match distro:
+        case Distro.DEBIAN | Distro.UBUNTU:
+            TestRun.executor.run_expect_success("update-initramfs -u")
+        case Distro.OPENEULER | Distro.CENTOS | Distro.REDHAT:
+            TestRun.executor.run_expect_success(
+                "dracut -f /boot/initramfs-$(uname -r).img $(uname -r)"
+            )