feat(docker): replace all-in-one image with FrankenPHP and Caddy based image + discard other images

- use serversideup/php as a base image
- remove nginx unit base
- remove app / webserver images
- add bundle stage to remove pipeline dependency
- update docker setup docs
- edit gitlabci rules and release logic

app/Controllers/MapController.php

@@ -45,7 +45,7 @@ class MapController extends BaseController
         if (! ($found = cache($cacheName))) {
             $episodes = new EpisodeModel()
                 ->where('`published_at` <= UTC_TIMESTAMP()', null, false)
-                ->where('location_geo is not', null)
+                ->where('location_geo is not')
                 ->findAll();
             $found = [];
             foreach ($episodes as $episode) {