[workflow] refactored the example check workflow (#2411)

* [workflow] refactored the example check workflow

* polish code

* polish code

* polish code

* polish code

* polish code

* polish code

* polish code

* polish code

* polish code

* polish code

* polish code

.github/workflows/scripts/example_checks/detect_changed_example.py

@@ -0,0 +1,24 @@
+import argparse
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-f', '--fileNameList', type=str, help="The list of changed files")
+    args = parser.parse_args()
+    name_list = args.fileNameList.split(":")
+    folder_need_check = set()
+    for loc in name_list:
+        # Find only the sub-sub-folder of 'example' folder
+        # the examples folder structure is like
+        # - examples
+        #   - area
+        #     - application
+        #       - file
+        if loc.split("/")[0] == "examples" and len(loc.split("/")) >= 4:
+            folder_need_check.add('/'.join(loc.split("/")[1:3]))
+    # Output the result using print. Then the shell can get the values.
+    print(list(folder_need_check))
+
+
+if __name__ == '__main__':
+    main()