This allows us to run kolab4 tests in CI (tested on centos8).
The test is executed via ci/Makefile (all target)
Some of the changes include:
* Configurable ssl certificate
* Do not persist the node modules
* swoole needs to be built before the rest
* Install kolab from the new mirror
* Buildkit seems to be the reason for the centos7 problems
* Various test fixes, and skip tests that don't currently pass
* docker-compose is now a plugin