Cannot change database name

When deploying manually (not using Docker compose) the docker image Mysql, setting the DB name to something OTHER than xwiki provokes a
"com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Access denied for user 'xwiki'@'%' to database 'xwiki'"

The problem seems to be related to hibernate file
<property name="connection.url">jdbc:mysql://db/${MYSQL_DATABASE:-xwiki}?useSSL=false</property>
The MYSQL_DATABASE environment variable doesn't seem to be taken into account, for a reason unknown to me. The JDBC driver should connect to xwikidb in my case but tries xwiki instead.

Command passed to reproduce.

docker run --name mysql-xwiki -v /share/gluster/mysql-xwiki:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=somerootpw -e MYSQL_USER=xwiki -e MYSQL_PASSWORD=xwikipwd -e MYSQL_DATABASE=xwikidb -d mysql:5.7 --character-set-server=utf8 --collation-server=utf8_bin --explicit-defaults-for-timestamp=1

docker run -d --name xwiki -p 8080:8080 -v /share/gluster/xwiki:/usr/local/xwiki -e MYSQL_USER=xwiki -e MYSQL_PASSWORD=xwikipwd -e MYSQL_DATABASE=xwikidb --link mysql-xwiki:db xwiki:mysql-tomcat