Merge "Implements: blueprint Implement a database container set"

compose/mariadb.yml

docker/mariadb-app/Dockerfile

docker/mariadb-app/build

docker/mariadb-app/config-mysql.sh

docker/mariadb-app/mysql-entrypoint.sh

docker/mariadb-data/Dockerfile

docker/mariadb-data/build

docker/mariadb/entrypoint.sh

docs/database-container-set.md

docs/integration-guide.md

tools/genenv