kopia: add updateScript and testVersion

{ lib, buildGoModule, fetchFromGitHub }:

{ lib, buildGoModule, fetchFromGitHub, gitUpdater, testers, kopia }:

buildGoModule rec {

  pname = "kopia";

    "-X github.com/kopia/kopia/repo.BuildInfo=${src.rev}"

  ];

  passthru = {

    updateScript = gitUpdater { rev-prefix = "v"; };

    tests = {

      kopia-version = testers.testVersion {

        package = kopia;

      };

    };

  };

  meta = with lib; {

    homepage = "https://kopia.io";

    description = "Cross-platform backup tool with fast, incremental backups, client-side end-to-end encryption, compression and data deduplication";