module add missing dep

flake.nix

@@ -65,7 +65,10 @@
         };
 
         config = lib.mkIf cfg.enable {
-          environment.systemPackages = [ zineshop-pkg ];
+          environment.systemPackages = [ 
+            zineshop-pkg
+            pkgs.poppler_utils #get first pdf page to png
+          ];
 
           users = {
             groups.zineshop = {};