Bring back some basic automated testing for PHP7.1 and mysql via gitlab-ci.
See merge request hubzilla/core!1332
(cherry picked from commit c39de966df)
b77acb3e add gitlab-ci.yml and phpunit.xml
22275f30 fix dba_pdoTest
0db047e5 fix phpunit error with html2markdown test and temporary disable failing markdown…
A tiny refactoring to make HTML 2 markdown conversion testable.
Add some unit tests to check the behavior of the now used HTML2Markdown library.
There are some differences compared to the old pixel418/markdownify library.