Add php packages to be able to run api unit tests inside the cli container

[dgarciabriseno]

Need to add the following php packages within the container build

Error message when trying to run tests inside the cli container:

(venv) ~/api/tests $ ../vendor/bin/phpunit --bootstrap autoload.php unit_tests/jpeg2000/JP2ImageXMLBoxTest.php 
PHPUnit requires the "dom", "json", "libxml", "mbstring", "tokenizer", "xml", "xmlwriter" extensions, but the "dom", "mbstring", "tokenizer", "xml", "xmlwriter" extensions are not available.