anchor.diff:        owner = "mattermost";
         repo = "mattermost-server";
         rev = "v${version}";
  -      sha256 = "0sal5ydm1cwnvf3acmiy0400ghhd6v0wj64mkxqwqf8ysnbxizwq";
  +      sha256 = "1k4rd8383bz9q23wgxnqcp69hcixaa0zd256h54wmwqw6fdn3bc0";
       };
   
       goPackagePath = "github.com/mattermost/mattermost-server";
  
positive.code: 
      src = fetchurl {
        url = "https://releases.mattermost.com/${version}/mattermost-${version}-linux-amd64.tar.gz";
        sha256 = "06dg0f6nrh3a2v3lnyn2s39nj5jpsvfkx3ypq4zjpks0srv4mgfz";
      };
  
      installPhase = ''
  
negative.code: { stdenv, fetchurl, fetchFromGitHub, buildGoPackage, buildEnv }:
  
  let
    version = "5.7.1";
  
    mattermost-server = buildGoPackage rec {
      name = "mattermost-server-${version}";
  