fix DinD host detection when using local socket

When using IPC socket (unix/npipe) to communicate with local docker
server docker-py implementation rewrites the base url to HTTP, see
https://github.com/docker/docker-py/blob/e901eac7a8c5f29c7720eafb9f58c8356cca2324/docker/api/client.py#L143-L168

We cannot rely on URL scheme in order to detect such connections.
Instead, we detect connection adapters added by docker-py api client:

- UnixHTTPAdapter
  https://github.com/docker/docker-py/blob/e901eac7a8c5f29c7720eafb9f58c8356cca2324/docker/transport/unixconn.py

- NpipeHTTPAdapter
  https://github.com/docker/docker-py/blob/e901eac7a8c5f29c7720eafb9f58c8356cca2324/docker/transport/npipeconn.py

As NpipeHTTPAdapter type may not be available outside of Windows we rely on
adapter-specific attributes.

Author: ikravets

testcontainers/core/docker_client.py

@@ -14,6 +14,7 @@
 import urllib
 import docker
 from docker.models.containers import Container
+from docker.transport import UnixHTTPAdapter
 from testcontainers.core.utils import inside_container
 from testcontainers.core.utils import default_gateway_ip
 
@@ -72,11 +73,14 @@ def host(self):
 
         except ValueError:
             return None
+        adapter = self.client.api.get_adapter(self.client.api.base_url)
+        is_ipc = isinstance(adapter, UnixHTTPAdapter)
+        is_ipc |= hasattr(adapter, "socket_path") or hasattr(adapter, "npipe_path")
+        is_ipc |= 'unix' in url.scheme or 'npipe' in url.scheme
+        if is_ipc and inside_container():
+            ip_address = default_gateway_ip()
+            if ip_address:
+                return ip_address
         if 'http' in url.scheme or 'tcp' in url.scheme:
             return url.hostname
-        if 'unix' in url.scheme or 'npipe' in url.scheme:
-            if inside_container():
-                ip_address = default_gateway_ip()
-                if ip_address:
-                    return ip_address
         return "localhost"