feat: fix additional properties

Signed-off-by: kjuulh <contact@kjuulh.io>

schemas/base.json

@@ -1,6 +1,6 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
-  "additionalProperties": false,
+  "additionalProperties": true,
   "properties": {
     "base": {
       "title": "Base url from which to base current cuddle plan on",
@@ -27,6 +27,9 @@
             },
             {
               "type": "object"
+            },
+            {
+              "type": "array"
             }
           ]
         }