[doc][build] Update all changed files timestamp to latest (#47115)

So these source files serving as dependency for doc files always get
rebuilt correctly.

---------

Signed-off-by: khluu <[email protected]>

ci/ray_ci/doc/cmd_load_doc_cache.py

@@ -95,7 +95,7 @@ def list_changed_and_added_files(ray_dir: str, latest_master_commit: str):
     )
     filenames = []
     for file in untracked_files + modified_files + diff_files_with_master:
-        filename = file.split(".")[0]  # Remove extension
+        filename = file
         if filename.startswith("doc/"):  # Remove "doc/" prefix
             filename = filename.replace("doc/", "")
         if filename.startswith("source/"):  # Remove "doc/" prefix

ci/ray_ci/doc/cmd_update_cache_env.py

@@ -17,6 +17,9 @@ def list_pending_files(ray_dir: str) -> List[str]:
         pending_files = f.readlines()
         pending_files = [file.strip() for file in pending_files]
     os.remove(f"{ray_dir}/{PENDING_FILES_PATH}")
+    for i in range(len(pending_files)):
+        if pending_files[i].split(".")[-1] != "py":
+            pending_files[i] = pending_files[i].split(".")[0]
     return pending_files
 
 
@@ -54,7 +57,7 @@ def update_environment_pickle(ray_dir: str, pending_files: List[str]) -> None:
 
 
 # TODO(@khluu): Check if this is necessary. Only update changed template files.
-def update_file_timestamp(ray_dir: str) -> None:
+def update_file_timestamp(ray_dir: str, pending_files: List[str]) -> None:
     """
     Update files other than source files to
     an old timestamp to avoid rebuilding them.
@@ -71,12 +74,23 @@ def update_file_timestamp(ray_dir: str) -> None:
             try:
                 # Change the access and modification times
                 os.utime(file_path, (new_timestamp, new_timestamp))
-                print(f"Changed timestamp for: {file_path}")
             except Exception as e:
                 print(f"Failed to change timestamp for {file_path}: {str(e)}")
 
     # Update Makefile timestamp
     os.utime(f"{ray_doc_dir}/Makefile", (new_timestamp, new_timestamp))
+
+    new_timestamp = datetime.now().timestamp()
+    for file in pending_files:
+        if file.split(".")[-1] != "py":
+            continue
+        file_path = os.path.join(ray_dir, file)
+        try:
+            # Change the access and modification times
+            os.utime(file_path, (new_timestamp, new_timestamp))
+        except Exception as e:
+            print(f"Failed to change timestamp for {file_path}: {str(e)}")
+
     print("Timestamp change operation completed.")
 
 
@@ -89,7 +103,7 @@ def main(ray_dir: str) -> None:
     print("Updating cache environment ...")
     pending_files = list_pending_files(ray_dir)
     update_environment_pickle(ray_dir, pending_files)
-    update_file_timestamp(ray_dir)
+    update_file_timestamp(ray_dir, pending_files)
 
 
 if __name__ == "__main__":