[PATCH v2 5/9] layers.schema.json: Add missing schema

This resolves the jsonschema error:
  error: The JSON document is not a valid JSON Schema

Signed-off-by: Rob Woolley <[email protected]>
---
 setup-schema/layers.schema.json | 1 +
 1 file changed, 1 insertion(+)

diff --git a/setup-schema/layers.schema.json b/setup-schema/layers.schema.json
index f42606941..2c192c8b0 100644
--- a/setup-schema/layers.schema.json
+++ b/setup-schema/layers.schema.json
@@ -1,4 +1,5 @@
 {
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
     "description": "OpenEmbedder Layer Setup Manifest",
     "type": "object",
     "additionalProperties": false,
-- 
2.49.0