git/buildGoModule + private repositories

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This works well.

test = pkgs.buildGoModule {
            name = "test";
            src = gitignore.lib.gitignoreSource ./.;
            doCheck = false;
            ldFlags = "-mod=mod";
            vendorHash = "sha256-ZKp4eeZRFWbogDadB8ZJfBXhSYyVYq1uPpz2WekvtPg=";
            CGO_ENABLED = 0;
            overrideModAttrs = (oldAttrs: {
              impureEnvVars = oldAttrs.impureEnvVars or [ ] ++ [
                "NIX_GITLAB_TOKEN"
              ];
              preBuild = /* bash */ ''
                export HOME=$(mktemp -d)
                cat > ~/.netrc <<EOF
                machine YOUR_PRIVATE_REPO
                  login oauth2
                  password $NIX_GITLAB_TOKEN
                EOF
                export GOPRIVATE=YOUR_PRIVATE_REPO/*
                export GONOSUMDB=YOUR_PRIVATE_REPO
              '';

              preferLocalBuild = true;
            });
          };