scripts: ci: check_compliance.py: Fix perl script running on windows

Add an if clause to the CheckPatch Class that checks for windows os.
If windows os, check for perl installation.
If no perl installation present. Fail the check.
Without this change, CheckPatch can fail silently on windows,
as windows does not have a way to run perl scripts.

Signed-off-by: Jacob Wienecke <jacob.wienecke@nxp.com>

scripts/ci/check_compliance.py

@@ -212,16 +212,29 @@ class CheckPatch(ComplianceTest):
         if not os.path.exists(checkpatch):
             self.skip(f'{checkpatch} not found')
 
+        # check for Perl installation on Windows
+        if os.name == 'nt':
+            if not shutil.which('perl'):
+                self.failure("Perl not installed - required for checkpatch.pl. Please install Perl or add to PATH.")
+                return
+            else:
+                cmd = ['perl', checkpatch]
+
+        # Linux and MacOS
+        else:
+            cmd = [checkpatch]
+
+        cmd.extend(['--mailback', '--no-tree', '-'])
         diff = subprocess.Popen(('git', 'diff', '--no-ext-diff', COMMIT_RANGE),
                                 stdout=subprocess.PIPE,
                                 cwd=GIT_TOP)
         try:
-            subprocess.run((checkpatch, '--mailback', '--no-tree', '-'),
+            subprocess.run(cmd,
                            check=True,
                            stdin=diff.stdout,
                            stdout=subprocess.PIPE,
                            stderr=subprocess.STDOUT,
-                           shell=True, cwd=GIT_TOP)
+                           shell=False, cwd=GIT_TOP)
 
         except subprocess.CalledProcessError as ex:
             output = ex.output.decode("utf-8")