Minimal example of using nix flake as "devshell" with direnv for a portable environment of various handy tools

.envrc

if has nix; then
  use flake
fi

flake.nix

{
  description = "my k8s project";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { nixpkgs, flake-utils, ... }: flake-utils.lib.eachDefaultSystem (system:
    let
      pkgs = import nixpkgs { system = "x86_64-linux"; config.allowUnfree = true; };
    in 
    {
      devShell = pkgs.mkShell {
        buildInputs = (with pkgs; [
          argocd
          bat
          cue
          curl
          fzf
          gatekeeper
          go-task
          jq
          jless
          kapp
          kail
          krew
          kubectl
          kubectl-cnpg
          kubectl-view-secret
          kubelogin-oidc
          kubernetes-helm
          k9s
          kubelogin-oidc
          kustomize
          miller
          minio-client
          talosctl
          packer
          vault-bin
        ]);
      };
    }
  );
}

Taskfile.yaml

# yaml-language-server: $schema=https://taskfile.dev/schema.json

version: "3"

tasks:
  nix:update: nix flake update