Have a proper install script

codecs/mozjpeg/flake.nix

@@ -22,7 +22,8 @@
       with pkgs;
       {
         packages = rec {
-          default = stdenv.mkDerivation {
+          default = mozjpeg-squoosh;
+          mozjpeg-squoosh = stdenv.mkDerivation {
             name = "mozjpeg-squoosh";
             src = ./.;
             nativeBuildInputs = [
@@ -75,19 +76,17 @@
             '';
             dontFixup = true;
           };
-        };
-        devShells.default = pkgs.mkShell {
-          packages = [
-            autoconf
-            automake
-            libtool
-            emscripten
-            pkg-config
-          ];
-          shellHook = ''
-            echo "Path to MozJPEG: ${mozjpeg-src}"
+          installScript = writeShellScriptBin "install.sh" ''
+            ${pkgs.coreutils}/bin/mkdir build
+            ${pkgs.coreutils}/bin/cp ${mozjpeg-squoosh}/* build/
           '';
         };
+        apps = {
+          install = {
+            type = "app";
+            # program = "
+          };
+        };
       }
     );
 }