feature: Support for remote docker host

Author: samadwar

src/sagemaker/local/utils.py

@@ -133,6 +133,7 @@ def get_docker_host():
     """Discover remote docker host address (if applicable) or use "localhost"
     
     Use "docker context inspect" to read current docker host endpoint url
+    url must start with "tcp://"
     
     Args:
 
@@ -142,7 +143,8 @@ def get_docker_host():
     try:
         docker_context_string = os.popen("docker context inspect").read()
         docker_context_host_url = json.loads(docker_context_string)[0]['Endpoints']['docker']['Host']
-        docker_host = docker_context_host_url.split("//")[1].rsplit(":")[0] if not docker_context_host_url.startswith("unix") else "localhost"
+        parsed_url = urlparse(docker_context_host_url)
+        docker_host = parsed_url.hostname if parsed_url.hostname and parsed_url.scheme=="tcp" else "localhost"
     except:
         docker_host = "localhost"
     return docker_host