The MIME type of apk files is application/vnd.android.package-archive and not apk.
I am not 100% sure how the mimes rule works, but I am sure it don't have a list of all available MIME types.
Don't know if this will work but try
$validator = Validator::make( Input::all(), array( 'apk' => 'required|mimes:application/vnd.android.package-archive' )
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