Merge branch 'nkupdates-v3.20' into 'v3.20'

.gitlab-ci.yml

Dockerfile

README.md

tests/cluster/docker-compose.yml.tmpl

tests/cluster/run-cluster-test

tests/replication/docker-compose.yml.tmpl

tests/replication/run-replication-test

...cal/share/flexible-docker-containers/init.d/42-mariadb.sh

...flexible-docker-containers/pre-init-tests.d/42-mariadb.sh

...al/share/flexible-docker-containers/tests.d/42-mariadb.sh

...xible-docker-containers/tests.d/43-mariadb-replication.sh

.../flexible-docker-containers/tests.d/99-mariadb-cluster.sh