Add PHPUnit tests workflow for Turso DB #950

Job	Run time
PHP 8.5 / SQLite latest / ubuntu-latest	2m 55s
PHP 8.0 / SQLite 3.37.0 / ubuntu-latest	2m 50s
PHP 8.3 / SQLite 3.46.1 / ubuntu-latest	2m 48s
PHP 8.2 / SQLite 3.45.1 / ubuntu-latest	3m 4s
PHP 8.1 / SQLite 3.40.1 / ubuntu-latest	3m 3s
PHP 7.3 / SQLite 3.31.1 / ubuntu-latest	2m 51s
PHP 8.4 / SQLite 3.51.2 / ubuntu-latest	2m 44s
PHP 7.2 / SQLite 3.27.0 / ubuntu-latest	3m 29s
PHP 7.4 / SQLite 3.34.1 / ubuntu-latest	2m 53s
	26m 37s

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