Import latest app updates from streamline

An updated set of source files and initialization was provided by streamline to
address issues observed during initial testing. These files have been updated in
order to generate a new set of app images.

docker/streamline-src/app/Services/StreamlineSetupServiceInterface.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace Streamline\Services;
+
+interface StreamlineSetupServiceInterface
+{
+    public function __construct();
+
+    public function saveStep($name, $status): bool;
+}