Add xdebug to php-unit-test images

xdebug is required for code coverage reports and is not included in the default php Alpine images.

$PHPIZE_DEPS is defined by the PHP Alpine image maintainers and documented as available for use in Dockerfiles. It will contain a list of packages needed to build PHP extensions.

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• e4c1ca5f - php 5.6 needs an older version of xdebug

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• 7ee3b182 - Remove build dependencies when finished

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I added a commit to remove the PHP build dependencies on the php-unit-test images. This drops the final and intermediate image size by around 200MB.

mentioned in commit c2a2966b

merged