Allow to filter search by multiple tags

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/graphql/schema/search.ex

@@ -46,7 +46,7 @@ defmodule Mobilizon.GraphQL.Schema.SearchType do
     @desc "Search events"
     field :search_events, :events do
       arg(:term, :string, default_value: "")
-      arg(:tag, :string)
+      arg(:tags, :string, description: "A comma-separated string listing the tags")
       arg(:location, :string, description: "A geohash for coordinates")
       arg(:radius, :float, default_value: 50)
       arg(:page, :integer, default_value: 1)