chore: nix packaging (#154)

* chore: adds nix derivation for distribution

* fixes the version

.gitignore

@@ -19,3 +19,4 @@ bin/
 # Gogland specific files
 .idea
 *.iml
+result

check-nix.sh

@@ -0,0 +1 @@
+nix-build --no-out-link -E 'with import <nixpkgs> {}; callPackage ./default.nix {}'

default.nix

@@ -0,0 +1,8 @@
+# default.nix
+let
+  nixpkgs = fetchTarball "https://github.com/NixOS/nixpkgs/tarball/nixos-22.11";
+  pkgs = import nixpkgs { config = {}; overlays = []; };
+in
+{
+  ergo = pkgs.callPackage ./ergo.nix { };
+}

ergo.nix

@@ -0,0 +1,35 @@
+ # allow our nixpkgs import to be overridden if desired
+{ pkgs ? import <nixpkgs> {}, fetchFromGitHub, buildGoModule, ... }:
+
+let 
+  _version = "v0.3.2";
+in
+  buildGoModule rec {
+    # name of our derivation
+    name = "ergo-proxy";
+    version = "${_version}";
+
+    # sources that will be used for our derivation.
+    src = fetchFromGitHub {
+      owner = "cristianoliveira";
+      repo = "ergo";
+      rev = _version;
+      sha256 = "sha256-C3lJWuRyGuvo33kvj3ktWKYuUZ2yJ8pDBNX7YZn6wNM=";
+    };
+
+    modSha256 = "0fagi529m1gf5jrqdlg9vxxq4yz9k9q8h92ch0gahp43kxfbgr4q";
+
+    vendorHash = "sha256-yXWM59zoZkQPpOouJoUd5KWfpdCBw47wknb+hYy6rh0=";
+
+    ldflags = [
+      "-s" "-w"
+      "-X main.VERSION=${_version}"
+    ];
+
+    meta = with pkgs.lib; {
+      description = "Ergo: The reverse proxy agent for local domain management";
+      homepage = "https://github.com/cristianoliveira/ergo";
+      license = licenses.mit;
+      maintainers = with maintainers; [ cristianoliveira ];
+    };
+  }