Fix nix builds: go dependencies are awful

default.nix

@@ -1,7 +1,9 @@
-{ buildGoApplication }: buildGoApplication {
+{buildGoModule}:
+buildGoModule {
   pname = "tsnet-proxy";
   version = "0.1";
   pwd = ./.;
   src = ./.;
-  modules = ./gomod2nix.toml;
+  vendorHash = "sha256-wg9DBjrBbfh1PbkuWajVctaO+WDgTS2pcXeeaX+OgDg=";
+  meta.mainProgram = "tsnet-proxy";
 }