Add a basic 'hello-world' buildable with Nix

.gitignore

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+nidus-sync

default.nix

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+{ pkgs ? import <nixpkgs> { } }:
+pkgs.buildGoModule rec {
+        meta = {
+                description = "Nidus Sync";
+                homepage = "https://github.com/Gleipnir-Technology/nidus-sync";
+        };
+        pname = "nidus-sync";
+        src = ./.;
+        subPackages = [];
+        version = "0.0.1";
+        # Needs to be updated after every modification of go.mod/go.sum
+        vendorHash = "sha256-3NQcLcPNfba20LXenLu/RcZistBzEGsRb75IogvSR68=";
+}

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1761999846,
+        "narHash": "sha256-IYlYnp4O4dzEpL77BD/lj5NnJy2J8qbHkNSFiPBCbqo=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "3de8f8d73e35724bf9abef41f1bdbedda1e14a31",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-25.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+        description = "Nidus sync";
+
+        inputs = {
+                nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+                flake-utils.url = "github:numtide/flake-utils";
+        };
+
+        outputs = { self, nixpkgs, flake-utils }:
+                flake-utils.lib.eachDefaultSystem (system:
+                        let
+                                pkgs = nixpkgs.legacyPackages.${system};
+                                package = import ./default.nix { inherit pkgs; };
+                        in
+                        {
+                                packages.default = package;
+                                packages.nidus-sync = package;
+
+                                # Development shell configuration
+                                devShells.default = pkgs.mkShell {
+                                        buildInputs = [
+                                                pkgs.go
+                                                pkgs.goose
+                                                pkgs.gotools
+                                                pkgs.lefthook
+                                        ];
+                                };
+                        }
+                );
+}

go.mod

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+module github.com/Gleipnir-Technology/nidus-sync
+
+go 1.24.9

main.go

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+package main
+import (
+	"fmt"
+)
+func main() {
+	fmt.Println("Hello World!")
+}