Add read-only NPM certificate discovery

dns_sync/npm_client.py

@@ -126,6 +126,15 @@ class NpmClient:
 
         return data
 
+    def certificates(self) -> list[dict[str, Any]]:
+        data = self.get_json("/nginx/certificates")
+
+        if not isinstance(data, list):
+            raise RuntimeError(
+                "NPM certificate response was not a list"
+            )
+
+        return data
 
     def certificates(self) -> list[dict[str, Any]]:
         data = self.get_json("/nginx/certificates")