Support proxy environment for docker client

Signed-off-by: PM Extra <pm@jubeat.net>

Author: PMExtra

docker/daemon/client.go

@@ -88,6 +88,7 @@ func tlsConfig(sys *types.SystemContext) (*http.Client, error) {
 
 func httpConfig() *http.Client {
 	return &http.Client{
+		Proxy: http.ProxyFromEnvironment,
 		Transport: &http.Transport{
 			TLSClientConfig: nil,
 		},