add cs-demo-manager appimage package, and group with postgresql for cs-tools module.

packages/cs-demo-manager/default.nix

@@ -0,0 +1,43 @@
+{ lib
+, stdenv
+, fetchurl
+, appimageTools
+, postgresql
+, procps
+, ...
+}:
+
+let
+  pname = "cs-demo-manager";
+  version = "3.18.2";
+
+  src = fetchurl {
+    url = "https://github.com/akiver/cs-demo-manager/releases/download/v${version}/CS-Demo-Manager-${version}.AppImage";
+    hash = "sha256-REEhqvfYSKD7EyIYJVlbkQu0h5FZcofc8X7Zhu1xZnA="; # You need to add the hash after first build attempt
+  };
+
+  appimageContents = appimageTools.extractType2 {
+    inherit pname version src;
+  };
+in
+appimageTools.wrapType2 {
+  inherit pname version src;
+
+  extraPkgs = pkgs: [ postgresql procps  ];
+
+  extraInstallCommands = ''
+    install -m 444 -D ${appimageContents}/cs-demo-manager.desktop $out/share/applications/cs-demo-manager.desktop
+    install -m 444 -D ${appimageContents}/cs-demo-manager.png $out/share/icons/hicolor/512x512/apps/cs-demo-manager.png
+
+    substituteInPlace $out/share/applications/cs-demo-manager.desktop \
+      --replace 'Exec=AppRun' 'Exec=${pname}'
+  '';
+
+  meta = with lib; {
+    description = "An application to manage Counter-Strike demos";
+    homepage = "https://github.com/akiver/cs-demo-manager";
+    license = licenses.gpl2Plus;
+    platforms = [ "x86_64-linux" ];
+    maintainers = [ ];
+  };
+}