Build modified streamline images

The official image from streamline does not currently work for the arm64
platform. As a temporary measure, the source code and docker build scripts
have been lifted from the official images and are used to build locally.

Some additional modifications are made to reduce overall image size, these
are documented in docker/README.md

docker/streamline-src/app/Http/Middleware/CheckActiveUsersLimit.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Streamline\Http\Middleware;
+
+use Closure;
+use Illuminate\Support\Facades\Auth;
+use Carbon\Carbon;
+use Streamline\Models\GeneralSettings;
+use Streamline\Models\User;
+
+class CheckActiveUsersLimit
+{
+    public function handle($request, Closure $next)
+    {
+        $general_settings = GeneralSettings::find(1);
+        $active_users = User::select('id')->get();
+        $number_of_active_users_limit = $general_settings->number_of_active_users_limit;
+
+        if(count($active_users) > $number_of_active_users_limit) {
+            flash("You have exceeded your active users limit. Please delete extra users to continue")->error();
+            return redirect('/users');
+        }
+        
+        return $next($request);
+    }
+}