Add devshell with Nix package manager

CHANGELOG.adoc

@@ -9,6 +9,12 @@ and this project adheres to https://semver.org/spec/v2.0.0.html[Semantic Version
 
 == Unreleased
 
+
+=== Added
+
+* Add a development environment with link:https://nixos.org/[Nix package manager].
+
+
 === Changed
 
 * Update the terms page.

flake.lock

@@ -0,0 +1,43 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1652372896,
+        "narHash": "sha256-lURGussfF3mGrFPQT3zgW7+RC0pBhbHzco0C7I+ilow=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "0d347c56f6f41de822a4f4c7ff5072f3382db121",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1652252629,
+        "narHash": "sha256-SvT64apetqc8P5nYp1/fOZvUmHUPdPFUZbhSpKy+1aI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "d2fc6856824cb87742177eefc8dd534bdb6c3439",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,15 @@
+{
+  description = "Basic flake template for setting up development shells";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = inputs@{ self, nixpkgs, ... }:
+    let systems = inputs.flake-utils.lib.defaultSystems;
+    in inputs.flake-utils.lib.eachSystem systems (system: {
+      devShells.default =
+        import ./shell.nix { pkgs = import nixpkgs { inherit system; }; };
+    });
+}

shell.nix

@@ -0,0 +1,9 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+with pkgs;
+
+mkShell { packages = [
+  asciidoctor
+  go
+  hugo
+]; }