message: Add debug builds section in the README
diff: @@ -42,6 +42,7 @@ Setup PHP with required extensions, php.ini configuration, code-coverage support
  - [Basic Setup](#basic-setup)
  - [Matrix Setup](#matrix-setup)
  - [Nightly Build Setup](#nightly-build-setup)
  + - [Debug Build Setup](#debug-build-setup)
  - [Thread Safe Setup](#thread-safe-setup)
  - [Force Update Setup](#force-update-setup)
  - [Verbose Setup](#verbose-setup)
  @@ -540,6 +541,23 @@ steps:
  tools: php-cs-fixer, phpunit
  ```
  +### Debug Build Setup
  +
  +> Set up a PHP build with debugging symbols.
  +
  +- Production release builds of PHP without debugging symbols are set up by default.
  +- You can use the `debug` environment variable to set up a build with debugging symbols for PHP 5.6 and above.
  +
  +```yaml
  +steps:
  +- name: Setup PHP with debugging symbols
  + uses: shivammathur/setup-php@v2
  + with:
  + php-version: '8.1'
  + env:
  + debug: true # specify true or false
  +```
  +
  ### Thread Safe Setup
  > Set up `TS` or `NTS` PHP on `Windows`.
  