feat: Add Nix support

Creates symlinks to the relevant executables in the Nix store, for
integration with IDEs and other tools.

.gitignore

@@ -3,3 +3,6 @@ dist/
 cdk.out/
 cdk.context.json
 build/
+/helm
+/kubectl
+/node

README.md

@@ -225,3 +225,8 @@ These tags are intended to be use in production as they will be published for ea
 ### Using different versions
 
 For each `Workflow` and `WorkflowTemplate`, there is a parameter `version_*` that allows to specify the version of the LINZ container to use.
+
+## Development
+
+1. Run `nix-shell` in the current directory to install all non-Node.js dependencies.
+1. Run `npm install` to install Node.js dependencies.

shell.nix

@@ -0,0 +1,20 @@
+let
+  pkgs = import (builtins.fetchTarball {
+    name = "nixos-unstable-2024-09-17";
+    url = "https://github.com/nixos/nixpkgs/archive/345c263f2f53a3710abe117f28a5cb86d0ba4059.tar.gz";
+    sha256 = "1llzyzw7a0jqdn7p3px0sqa35jg24v5pklwxdybwbmbyr2q8cf5j";
+  }) { };
+in
+pkgs.mkShell {
+  packages = [
+    pkgs.argo
+    pkgs.awscli2
+    pkgs.bashInteractive
+    pkgs.kubectl
+    pkgs.kubernetes-helm
+    pkgs.nodejs
+  ];
+  shellHook = ''
+    ln --force --symbolic "${pkgs.kubernetes-helm}/bin/helm" "${pkgs.kubectl}/bin/kubectl" "${pkgs.nodejs}/bin/node" .
+  '';
+}