feat: customize phpstan config file name (#5940)

Co-authored-by: Demo user account <demo@nixos.(none)>

Author: shabbir-genetech

README.md

@@ -230,6 +230,7 @@ You can configure super-linter using the following environment variables:
 | **POWERSHELL_CONFIG_FILE**                      | `.powershell-psscriptanalyzer.psd1` | Filename for [PSScriptAnalyzer configuration](https://learn.microsoft.com/en-gb/powershell/utility-modules/psscriptanalyzer/using-scriptanalyzer)                                                                |
 | **PHP_CONFIG_FILE**                             | `php.ini`                       | Filename for [PHP Configuration](https://www.php.net/manual/en/configuration.file.php) (ex: `php.ini`)                                                                                                               |
 | **PHP_PHPCS_FILE_NAME**                         | `phpcs.xml`                     | Filename for [PHP CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer) (ex: `.phpcs.xml`, `.phpcs.xml.dist`)                                                                                                   |
+| **PHP_PHPSTAN_CONFIG_FILE**                     | `phpstan.neon`                  | Filename for [PHPStan Configuration](https://phpstan.org/config-reference) (ex: `phpstan.neon`)                                                                                                                      |
 | **PROTOBUF_CONFIG_FILE**                        | `.protolintrc.yml`              | Filename for [protolint configuration](https://github.com/yoheimuta/protolint/blob/master/_example/config/.protolint.yaml) (ex: `.protolintrc.yml`)                                                                  |
 | **PYTHON_BLACK_CONFIG_FILE**                    | `.python-black`                 | Filename for [black configuration](https://github.com/psf/black/blob/main/docs/guides/using_black_with_other_tools.md#black-compatible-configurations) (ex: `.isort.cfg`, `pyproject.toml`)                          |
 | **PYTHON_FLAKE8_CONFIG_FILE**                   | `.flake8`                       | Filename for [flake8 configuration](https://flake8.pycqa.org/en/latest/user/configuration.html) (ex: `.flake8`, `tox.ini`)                                                                                           |

lib/linter.sh

@@ -221,7 +221,7 @@ PHP_BUILTIN_FILE_NAME="${PHP_CONFIG_FILE:-php.ini}"
 # shellcheck disable=SC2034  # Variable is referenced indirectly
 PHP_PHPCS_FILE_NAME="${PHP_PHPCS_FILE_NAME:-phpcs.xml}"
 # shellcheck disable=SC2034  # Variable is referenced indirectly
-PHP_PHPSTAN_FILE_NAME="phpstan.neon"
+PHP_PHPSTAN_FILE_NAME="${PHP_PHPSTAN_CONFIG_FILE:-phpstan.neon}"
 # shellcheck disable=SC2034  # Variable is referenced indirectly
 PHP_PSALM_FILE_NAME="psalm.xml"
 # shellcheck disable=SC2034  # Variable is referenced indirectly