add bg variants

build.nix

@@ -1,15 +1,17 @@
-{ stdenv, imagemagick, envsubst, python3Full, zip, nopng ? false, ... }:
+{ stdenv, imagemagick, envsubst, python3Full, zip, util-linux, nopng ? false, bg ? "none", ... }:
 stdenv.mkDerivation {
   pname = "BetaNuBranding";
-  version = "1.0.0";
+  version = "1.0.1";
 
   src = ./src;
 
-  nativeBuildInputs = [ imagemagick envsubst python3Full zip ];
+  nativeBuildInputs = [ imagemagick envsubst python3Full zip util-linux ];
 
   buildPhase = ''
     python build.py
-    ${if nopng then "" else "mogrify -format png -density 2500 -background none out/*.svg" }
+    cd out
+    ${if nopng then "" else "mogrify -format png -density 2500 -background ${bg} *.svg" }
+    cd ..
   '';
 
   installPhase = ''

flake.nix

@@ -46,6 +46,8 @@
         packages = rec {
           branding = pkgs.callPackage ./build.nix { };
           branding-nopng = pkgs.callPackage ./build.nix { nopng = true; };
+          branding-white = pkgs.callPackage ./build.nix { bg = "white"; };
+          branding-black = pkgs.callPackage ./build.nix { bg = "black"; };
           deploy = pkgs.callPackage ./deploy.nix { src = branding; };
           default = branding;
         };