feat: add a duckdb query for identifying nixos images and producing a parquet file

duckdb/nixos-images.sql

@@ -0,0 +1,13 @@
+SET memory_limit = '64GB';
+SET threads = 16;
+SET preserve_insertion_order = false;
+SET temp_directory = '/tmp/duckdb';
+
+COPY (
+    SELECT *
+    FROM 'datasets/narinfos-2026-01-06T01-13Z.parquet'
+    WHERE
+        pname LIKE 'nixos-%.iso'
+        OR pname LIKE 'nixos-%.img'
+        OR pname LIKE 'nixos-amazon-image-%'
+) TO 'datasets/nixos-images-2026-01-06T01-13Z.parquet' (FORMAT PARQUET);