Add signed extension release workflow

extension/managed_schema.json

@@ -0,0 +1,17 @@
+{
+  "type": "object",
+  "properties": {
+    "collectorUrl": {
+      "type": "string",
+      "description": "HTTPS URL of the history collector endpoint."
+    },
+    "apiToken": {
+      "type": "string",
+      "description": "Bearer token for the history collector."
+    },
+    "deviceId": {
+      "type": "string",
+      "description": "Stable device identifier sent to the collector."
+    }
+  }
+}