Adding to the PHP images because certain WP-specific Grunt tasks rely on PHP,
so it makes sense to have it all in one place.

See also gitlab/ci/wordpress#1

Adding to the PHP images because certain WP-specific Grunt tasks rely on PHP,
so it makes sense to have it all in one place.

See also gitlab/ci/wordpress#1

Adding to the PHP images because certain WP-specific Grunt tasks rely on PHP,
so it makes sense to have it all in one place.

See also gitlab/ci/wordpress#1

Its presence is reasonable alongside subversion.

Fixes #1