fix validate.sh

[reinthal]

Whats the issue?

Validation scripts throws an error when trying o run scripts/validate.sh locally

How can I reproduce this issue?

Make a template from this repo install yq version 3.2.2 and run scripts/validate.sh

How did I test?

Apply patch and run scripts/validate.sh

Comment on fix

Fix adds dependency on the tool cat being available on the system.

Environment

 yq --version
yq 3.2.2

❯ cat /etc/os-release
ANSI_COLOR="1;34"
BUG_REPORT_URL="https://github.com/NixOS/nixpkgs/issues"
BUILD_ID="24.11.20240917.658e722"
DOCUMENTATION_URL="https://nixos.org/learn.html"
HOME_URL="https://nixos.org/"
ID=nixos
IMAGE_ID=""
IMAGE_VERSION=""
LOGO="nix-snowflake"
NAME=NixOS
PRETTY_NAME="NixOS 24.11 (Vicuna)"
SUPPORT_URL="https://nixos.org/community.html"
VERSION="24.11 (Vicuna)"
VERSION_CODENAME=vicuna
VERSION_ID="24.11"