minor #167 ci: Add a monthly schedule for the pipeline (theofidry) #353

Job	Run time
PHP 7.4 - Symfony 5.4.* - Composer --prefer-stable	1m 50s
PHP 8.0 - Symfony 5.4.* - Composer --prefer-stable	2m 5s
PHP 8.1 - Symfony 5.4.* - Composer --prefer-stable	1m 36s
PHP 8.1 - Symfony 6.2.* - Composer --prefer-stable	1m 37s
PHP 8.2 - Symfony 5.4.* - Composer --prefer-stable	1m 59s
PHP 8.2 - Symfony 6.2.* - Composer --prefer-stable	1m 40s
PHP 7.2 - Symfony 5.4.* - Composer --prefer-stable --prefer-lowest	1m 50s
PHP 7.2 - Symfony 5.4.* - Composer --prefer-stable	1m 39s
PHP 7.3 - Symfony 5.4.* - Composer --prefer-stable	1m 25s
PHP 8.2 - Symfony 6.3.x-dev	1m 13s
	16m 54s

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