"wp config has" fails in a read-only environment

[pwtyler]

Bug Report

• Yes, I reviewed the contribution guidelines.
• Yes, more specifically, I reviewed the guidelines on how to write clear bug reports.

Describe the current, buggy behavior

wp config has fails in a read-only environment.

Error: Could not process the 'wp-config.php' transformation.
Reason: wp-config.php is not writable.

Describe how other contributors can replicate this bug
Steps to reproduce:

#!/bin/bash

curl -O https://raw.githubusercontent.com/pantheon-systems/WordPress/default/wp-config.php

wp config has table_prefix
echo $? # Output: 0
chmod 444 wp-config.php
wp config has table_prefix
echo $? # Output: 1

Describe what you would expect as the correct outcome

wp config has works when the file is not readable, as it is only reading the content of the file.
Let us know what environment you are running this on

Originally encountered on Pantheon's read-only live environment, but reproduced locally

OS:	Darwin 23.5.0 Darwin Kernel Version 23.5.0: Wed May  1 20:12:58 PDT 2024; root:xnu-10063.121.3~5/RELEASE_ARM64_T6000 arm64
Shell:	/bin/zsh
PHP binary:	/opt/homebrew/Cellar/php/8.3.2/bin/php
PHP version:	8.3.2
php.ini used:	/opt/homebrew/etc/php/8.3/php.ini
MySQL binary:	/opt/homebrew/bin/mysql
MySQL version:	mysql from 11.2.2-MariaDB, client 15.2 for osx10.19 (arm64) using  EditLine wrapper
SQL modes:	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
WP-CLI root dir:	phar://wp-cli.phar/vendor/wp-cli/wp-cli
WP-CLI vendor dir:	phar://wp-cli.phar/vendor
WP_CLI phar path:	/Users/philtyler/Desktop/scratch
WP-CLI packages dir:
WP-CLI cache dir:	/Users/philtyler/.wp-cli/cache
WP-CLI global config:
WP-CLI project config:
WP-CLI version:	2.10.0

[ernilambar]

Yah, it seems WPConfigTransformer checks in the constructor whether config file is writable or not.

https://github.com/wp-cli/wp-config-transformer/blob/main/src/WPConfigTransformer.php#L48-L50