Set up variant tags as searchable

app/models/spree/variant.rb

@@ -21,7 +21,7 @@ module Spree
     acts_as_taggable
 
     searchable_attributes :sku, :display_as, :display_name, :primary_taxon_id, :supplier_id
-    searchable_associations :product, :default_price, :primary_taxon, :supplier
+    searchable_associations :product, :default_price, :primary_taxon, :supplier, :tags
     searchable_scopes :active, :deleted
 
     NAME_FIELDS = ["display_name", "display_as", "weight", "unit_value", "unit_description"].freeze

config/initializers/acts_as_taggable_on.rb

@@ -1 +1,19 @@
+# frozen_string_literal: true
+
 ActsAsTaggableOn.force_lowercase = true
+
+# Monkey patch suggested as workaround to the allowlisted issue
+# This may be removed when an official fix is included in Ransack
+module ActsAsTaggableOn
+  class Tag
+    class << self
+      def ransackable_associations(_auth_object = nil)
+        ["taggings"]
+      end
+
+      def ransackable_attributes(_auth_object = nil)
+        ["name"]
+      end
+    end
+  end
+end