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/Controllers/PermissionController.php

@@ -0,0 +1,130 @@
+<?php
+
+namespace Streamline\Http\Controllers;
+
+use Illuminate\Http\Request;
+use Auth;
+use Spatie\Permission\Models\Role;
+use Spatie\Permission\Models\Permission;
+use Session;
+
+class PermissionController extends Controller {
+
+    public function __construct() {
+        $this->middleware(['auth', 'isAdmin']); //isAdmin middleware lets only users with a //specific permission permission to access these resources
+    }
+
+    /**
+     * Display a listing of the resource.
+     *
+     * @return \Illuminate\Http\Response
+     */
+    public function index() {
+        $permissions = Permission::all(); //Get all permissions
+        return view('permissions.index')->with('permissions', $permissions);
+    }
+
+    /**
+     * Show the form for creating a new resource.
+     *
+     * @return \Illuminate\Http\Response
+     */
+    public function create() {
+        $roles = Role::get(); //Get all roles
+        return view('permissions.create')->with('roles', $roles);
+    }
+
+    /**
+     * Store a newly created resource in storage.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @return \Illuminate\Http\Response
+     */
+    public function store(Request $request) {
+        $this->validate($request, [
+            'name' => 'required|max:40',
+        ]);
+
+        $name = $request['name'];
+        $permission = new Permission();
+        $permission->name = $name;
+
+        $roles = $request['roles'];
+
+        $permission->save();
+
+        if (!empty($request['roles'])) { //If one or more role is selected
+            foreach ($roles as $role) {
+                $r = Role::where('id', '=', $role)->firstOrFail(); //Match input role to db record
+
+                $permission = Permission::where('name', '=', $name)->first(); //Match input //permission to db record
+                $r->givePermissionTo($permission);
+            }
+        }
+
+        return redirect()->route('permissions.index')
+                        ->with('flash_message', 'Permission' . $permission->name . ' added!');
+    }
+
+    /**
+     * Display the specified resource.
+     *
+     * @param  int  $id
+     * @return \Illuminate\Http\Response
+     */
+    public function show($id) {
+        return redirect('permissions');
+    }
+
+    /**
+     * Show the form for editing the specified resource.
+     *
+     * @param  int  $id
+     * @return \Illuminate\Http\Response
+     */
+    public function edit($id) {
+        $permission = Permission::find($id);
+        return view('permissions.edit', compact('permission'));
+    }
+
+    /**
+     * Update the specified resource in storage.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  int  $id
+     * @return \Illuminate\Http\Response
+     */
+    public function update(Request $request, $id) {
+        $permission = Permission::find($id);
+        $this->validate($request, [
+            'name' => 'required|max:40',
+        ]);
+        $input = $request->all();
+        $permission->fill($input)->save();
+
+        return redirect()->route('permissions.index')
+                        ->with('flash_message', 'Permission' . $permission->name . ' updated!');
+    }
+
+    /**
+     * Remove the specified resource from storage.
+     *
+     * @param  int  $id
+     * @return \Illuminate\Http\Response
+     */
+    public function destroy($id) {
+        $permission = Permission::find($id);
+
+        //Make it impossible to delete this specific permission 
+        if ($permission->name == "Administer roles & permissions") {
+            return redirect()->route('permissions.index')
+                            ->with('flash_message', 'Cannot delete this Permission!');
+        }
+
+        $permission->delete();
+
+        return redirect()->route('permissions.index')
+                        ->with('flash_message', 'Permission deleted!');
+    }
+
+}