fix(machines/storage01): scrape all exporter ports

There may be more than one port for a given node.

Signed-off-by: Ryan Lahfa <ryan@dgnum.eu>

machines/nixos/storage01/prometheus.nix

@@ -18,7 +18,9 @@ let
       node:
       { config, ... }:
       lib.optional config.dgn-node-monitoring.enable {
-        targets = [ "${node}.dgnum:${builtins.toString config.dgn-node-monitoring.port}" ];
+        targets = map (p: "${node}.dgnum:${builtins.toString p}") (
+          builtins.attrValues config.dgn-node-monitoring.ports
+        );
         labels = {
           host = node;
         };