anchor.diff:  
     dotnetSdk = dotnetCorePackages.sdk_3_1;
     runtimeId = "linux-x64";
  +  fakeSha1 = "0000000000000000000000000000000000000000";
   in
   stdenv.mkDerivation rec {
     pname = "github-runner";
  
positive.code:   src = fetchFromGitHub {
      owner = "actions";
      repo = "runner";
      rev = "c8caf59bb7adaa87c4cf8f61372670d338a13f2d"; # v${version}
      sha256 = "sha256-Nl1FSjwweVqdQEVhqt4PEcqZbF7htNT279yx1nGuAe0=";
    };
  
  
negative.code:       -p:PackageRuntime="${runtimeId}" \
        -p:BUILDCONFIG="Release" \
        -p:RunnerVersion="${version}" \
        -p:GitInfoCommitHash="${fakeSha1}" \
        src/dir.proj
  
      runHook postBuild
  