XDOCKER-264: Upgrade stable version to 15.0

15/mariadb-tomcat/.env

15/mariadb-tomcat/Dockerfile

15/mariadb-tomcat/docker-compose.yml

15/mariadb-tomcat/mariadb/init.sql

15/mariadb-tomcat/mariadb/xwiki.cnf

15/mariadb-tomcat/tomcat/setenv.sh

15/mariadb-tomcat/xwiki/docker-entrypoint.sh

15/mariadb-tomcat/xwiki/hibernate.cfg.xml

15/mysql-tomcat/.env

15/mysql-tomcat/Dockerfile

15/mysql-tomcat/docker-compose.yml

15/mysql-tomcat/mysql/init.sql

15/mysql-tomcat/mysql/xwiki.cnf

15/mysql-tomcat/tomcat/setenv.sh

15/mysql-tomcat/xwiki/docker-entrypoint.sh

15/mysql-tomcat/xwiki/hibernate.cfg.xml

15/postgres-tomcat/.env

15/postgres-tomcat/Dockerfile

15/postgres-tomcat/docker-compose.yml

15/postgres-tomcat/tomcat/setenv.sh