turbovnc: Add programs.turbovnc, add test for headless software OpenGL

pkgs/tools/admin/turbovnc/default.nix

@@ -1,6 +1,7 @@
 { lib
 , stdenv
 , fetchFromGitHub
+, nixosTests
 
 # Dependencies
 , cmake
@@ -101,6 +102,8 @@ stdenv.mkDerivation rec {
       --prefix PATH : ${lib.makeBinPath [ openssh ]}
   '';
 
+  passthru.tests.turbovnc-headless-server = nixosTests.turbovnc-headless-server;
+
   meta = {
     homepage = "https://turbovnc.org/";
     license = lib.licenses.gpl2Plus;