Fix code scanning alert no. 111: Incomplete URL substring sanitization (#12305)

Signed-off-by: -LAN- <laipz8200@outlook.com>
Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

api/services/app_dsl_service.py

 import uuid
 from enum import StrEnum
 from typing import Optional, cast
+from urllib.parse import urlparse
 from uuid import uuid4
 
 import yaml  # type: ignore
                 )
             try:
                 max_size = 10 * 1024 * 1024  # 10MB
-                # tricky way to handle url from github to github raw url
-                if yaml_url.startswith("https://github.com") and yaml_url.endswith((".yml", ".yaml")):
+                parsed_url = urlparse(yaml_url)
+                if (
+                    parsed_url.scheme == "https"
+                    and parsed_url.netloc == "github.com"
+                    and parsed_url.path.endswith((".yml", ".yaml"))
+                ):
                     yaml_url = yaml_url.replace("https://github.com", "https://raw.githubusercontent.com")
                     yaml_url = yaml_url.replace("/blob/", "/")
                 response = ssrf_proxy.get(yaml_url.strip(), follow_redirects=True, timeout=(10, 10))