refactor(wpcarro): Define common.shell-utils

DRYing up some of my configuration.

Change-Id: I137692789426efc6a6c6880029e605813674fdbe
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4592
Reviewed-by: wpcarro <wpcarro@gmail.com>
Autosubmit: wpcarro <wpcarro@gmail.com>
Tested-by: BuildkiteCI

users/wpcarro/common.nix

@@ -0,0 +1,27 @@
+{ pkgs, ... }:
+
+{
+  # Command-line tools I commonly used and want available on most (or all) of my
+  # machines.
+  shell-utils = with pkgs; [
+    bat
+    dig
+    direnv
+    diskus
+    emacs
+    exa
+    fd
+    fzf
+    git
+    jq
+    mkpasswd
+    nmap
+    python3
+    ripgrep
+    tldr
+    tokei
+    tree
+    vim
+    xclip
+  ];
+}