fix(nix): disable tests, set meta.mainProgram for package

flake.nix

@@ -37,14 +37,26 @@
 
             vendorHash = "sha256-5Xr6mwPtsqEliKeKv2rhhp6JC7u3coP4nnhIxGMqccU=";
 
+            nativeInstallCheckInputs = [ pkgs.versionCheckHook ];
+
             env = {
               CGO_ENABLED = 0;
             };
 
             ldflags = [
+              "-s"
+              "-w"
               "-X main.newtVersion=${version}"
             ];
 
+            # Tests are broken due to a lack of Internet.
+            # Disable running `go test`, and instead do
+            # a simple version check instead.
+            doCheck = false;
+            doInstallCheck = true;
+
+            versionCheckProgramArg = [ "-version" ];
+
             meta = {
               description = "A tunneling client for Pangolin";
               homepage = "https://github.com/fosrl/newt";
@@ -52,6 +64,7 @@
               maintainers = [
                 lib.maintainers.water-sucks
               ];
+              mainProgram = "newt";
             };
           };
         }