feat: chialab/php-compat images

compat/README.md

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+<p align="center">
+    <a href="https://www.chialab.io/p/docker-php">
+        <img alt="Docker PHP Images logo" width="144" height="144" src="https://raw.githack.com/chialab/docker-php/master/logo.svg" />
+    </a>
+</p>
+
+<p align="center">
+  <strong>Docker PHP images</strong>
+</p>
+
+<p align="center">
+    <a href="https://github.com/chialab/docker-php/actions"><img alt="GitHub Workflow Status" src="https://img.shields.io/github/actions/workflow/status/chialab/docker-php/main.yml?branch=main&style=flat-square"></a>
+    <a href="https://github.com/chialab/docker-php"><img alt="Source link" src="https://img.shields.io/badge/Source-GitHub-lightgrey.svg?style=flat-square"></a>
+    <a href="https://www.chialab.it"><img alt="Authors link" src="https://img.shields.io/badge/Authors-Chialab-lightgrey.svg?style=flat-square"></a>
+    <a href="https://hub.docker.com/r/chialab/php-pcov/"><img alt="Docker Pulls" src="https://img.shields.io/docker/pulls/chialab/php-pcov.svg?style=flat-square"></a>
+    <a href="https://github.com/chialab/docker-php/blob/master/LICENSE"><img alt="License" src="https://img.shields.io/github/license/chialab/docker-php.svg?style=flat-square"></a>
+</p>
+
+---
+
+Compatibility docker images.
+
+### PHP 5.6
+
+Built from the latest official PHP 5.6 Dockerfiles ([this](https://github.com/docker-library/php/tree/783878384a8f3953ed571e5a34ba0fe546726c85) commit),
+with PHP compiled to use MariaDB's `libmysqlclient` connector. This fixes connections with MySQL 8.0+, which uses a default
+collation not recognized by the official image's `mysqlnd` connector (`utf8mb4`).
+
+## Available tags
+- `5.6`
+- `5.6-apache`
+- `5.6-fpm`
+
+## Installed extensions
+The following modules and extensions have been enabled,
+in addition to those you can already find in the [official PHP image](https://hub.docker.com/r/_/php/):
+
+- `amqp`
+- `bcmath`
+- `bz2`
+- `calendar`
+- `event`
+- `exif`
+- `gd`
+- `gettext`
+- `iconv`
+- `imagick`
+- `intl`
+- `ldap`
+- `mbstring`
+- `mcrypt` (_only PHP ≤ 7.1_)
+- `memcached`
+- `mysql` (_only PHP 5.x_)
+- `mysqli`
+- `pcov`
+- `pdo_mysql`
+- `pdo_pgsql`
+- `pgsql`
+- `redis`
+- `soap`
+- `sockets`
+- `xsl`
+- `Zend OPcache`
+- `zip`
+
+You will probably not need all this stuff. Even if having some extra extensions loaded ain't a big issue in most cases (especially in a development environment), you will very likely want to checkout this repository, remove unwanted extensions from the `Dockerfile`, and build your own image — for sometimes removing is easier than adding. 😉
+
+## Composer
+[Composer](https://getcomposer.org) is installed globally in all images. Please, refer to their documentation for usage hints.
+Since 2020/11/01 both version 1 and 2 are installed, available through `composer1` and `composer2` commands respectively (`composer` in now a symlink to `composer2`).  
+[Prestissimo (composer plugin)](https://github.com/hirak/prestissimo) is installed globally in all images, for use with Composer version 1. It's a plugin that downloads packages in parallel to speed up the installation process of Composer packages.
+
+## Contributing
+If you find an issue, or have a special wish not yet fulfilled, please [open an issue on GitHub](https://github.com/chialab/docker-php/issues) providing as many details as you can (the more you are specific about your problem, the easier it is for us to fix it).
+
+Pull requests are welcome, too! 😁 Please, run `make build` and `make test` before attempting a pull request. Also, it would be nice if you could stick to the [best practices for writing Dockerfiles](https://docs.docker.com/articles/dockerfile_best-practices/).
+
+---
+
+## License
+
+Docker PHP Images is released under the [MIT](https://github.com/chialab/docker-php/blob/master/LICENSE) license.