vscode: add testbed

modules/vscode/testbed.nix

@@ -0,0 +1,19 @@
+{ pkgs, ... }:
+
+# We are using VSCodium because VSCode is an unfree package
+let package = pkgs.vscodium;
+
+in {
+  stylix.testbed.application = {
+    enable = true;
+    name = "codium";
+    inherit package;
+  };
+
+  home-manager.sharedModules = [{
+    programs.vscode = {
+      enable = true;
+      inherit package;
+    };
+  }];
+}