Tests

[Feature]: Add docker setup and an updated README for people who want to contribute #563

Job	Run time
Symfony - PHP 8.2 - flags - mysqldump default-mysql-client	56s
Symfony - PHP 7.4 - flags update --prefer-lowest - mysqldump	57s
Symfony ^5.4 - PHP 7.4 - flags - mysqldump	1m 2s
Symfony ^5.4 - PHP 8.1 - flags - mysqldump	56s
Symfony ^5.4 - PHP 8.1 - flags - mysqldump mariadb-client	27s
Symfony ^6.3 - PHP 8.2 - flags - mysqldump	1m 6s
Symfony - PHP 8.2 - flags remove --dev --no-progress doctrine/phpcr-bundle doctrine/phpcr-odm - mysqldump	56s
Symfony ^7.0 - PHP 8.2 - flags remove --dev --no-progress doctrine/phpcr-bundle doctrine/phpcr-odm - mysqldump	1m 5s
	7m 25s

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