dotnet: add self-contained test

        run = checkConsoleOutput "$src/test";

      };

      self-contained = mkDotnetTest {

        name = "self-contained";

        template = "console";

        usePackageSource = true;

        build = "dotnet publish --use-current-runtime --sc -o $out";

        runtime = null;

        run = checkConsoleOutput "$src/test";

      };

      single-file = mkDotnetTest {

        name = "single-file";

        template = "console";