Support naming docker images on eggs; closes #4052

Bumps PTDL_v1 export images to PTDL_v2, updates the Minecraft specific eggs to use named images.

database/migrations/2022_05_07_165334_migrate_egg_images_array_to_new_format.php

@@ -0,0 +1,40 @@
+<?php
+
+use Illuminate\Support\Facades\DB;
+use Illuminate\Database\Migrations\Migration;
+
+class MigrateEggImagesArrayToNewFormat extends Migration
+{
+    /**
+     * Run the migrations. This will loop over every egg on the system and update the
+     * images array to both exist, and have key => value pairings to support naming the
+     * images provided.
+     */
+    public function up()
+    {
+        DB::table('eggs')->select(['id', 'docker_images'])->cursor()->each(function ($egg) {
+            $images = is_null($egg->docker_images) ? [] : json_decode($egg->docker_images, true, 512, JSON_THROW_ON_ERROR);
+
+            $results = [];
+            foreach ($images as $key => $value) {
+                $results[is_int($key) ? $value : $key] = $value;
+            }
+
+            DB::table('eggs')->where('id', $egg->id)->update(['docker_images' => $results]);
+        });
+    }
+
+    /**
+     * Reverse the migrations. This just keeps the values from the docker images array.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        DB::table('eggs')->select(['id', 'docker_images'])->cursor()->each(function ($egg) {
+            DB::table('eggs')->where('id', $egg->id)->update([
+                'docker_images' => array_values(json_decode($egg->docker_images, true, 512, JSON_THROW_ON_ERROR)),
+            ]);
+        });
+    }
+}