nix: set up tooling

.envrc

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+use flake

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1750134718,
+        "narHash": "sha256-v263g4GbxXv87hMXMCpjkIxd/viIF7p3JpJrwgKdNiI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "9e83b64f727c88a7711a2c463a7b16eedb69a84c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Fast and minimal parallel TCP connection testing utility ";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs?ref=nixos-unstable";
+
+  outputs = {
+    self,
+    nixpkgs,
+    ...
+  }: let
+    systems = ["x86_64-linux" "aarch64-linux"];
+    forEachSystem = nixpkgs.lib.genAttrs systems;
+
+    pkgsForEach = nixpkgs.legacyPackages;
+  in {
+    packages = forEachSystem (system: {
+      default = pkgsForEach.${system}.callPackage ./nix/package.nix {};
+    });
+
+    devShells = forEachSystem (system: {
+      default = pkgsForEach.${system}.callPackage ./nix/shell.nix {};
+    });
+
+    hydraJobs = self.packages;
+  };
+}

nix/package.nix

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+{
+  lib,
+  buildGoModule,
+}: let
+  fs = lib.fileset;
+  s = ../.;
+in
+  buildGoModule {
+    pname = "tct";
+    version = "0.1.0";
+
+    src = fs.toSource {
+      root = s;
+      fileset = fs.unions [
+        (fs.fileFilter (file: builtins.any file.hasExt ["go"]) s)
+        ../go.mod
+        ../go.sum
+      ];
+    };
+
+    vendorHash = "sha256-m5mBubfbXXqXKsygF5j7cHEY+bXhAMcXUts5KBKoLzM=";
+
+    ldflags = ["-s" "-w"];
+  }

nix/shell.nix

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+{
+  mkShell,
+  go,
+  gopls,
+  delve,
+}:
+mkShell {
+  name = "go";
+  packages = [
+    delve
+    go
+    gopls
+  ];
+}