Use configuration input struct (#645)

As we will be passing more flags to configure
 local agents, we need a more flexible type

client/cmd/ssh.go

@@ -56,7 +56,9 @@ var sshCmd = &cobra.Command{
 
 		ctx := internal.CtxInitState(cmd.Context())
 
-		config, err := internal.ReadConfig("", "", configPath, nil)
+		config, err := internal.ReadConfig(internal.ConfigInput{
+			ConfigPath: configPath,
+		})
 		if err != nil {
 			return err
 		}