[Misc] Use a better (more specific) tomcat image tag so that if tomcat changes the jdk version for tag "9", we won't be affected

[Misc] Remove my name and email now that the module is in the XWiki GitHub Organization and this maintained by the XWiki Committers

* Revert the MySQL upgrade because of issues for 12.10.x and 13.2.x branches

* Also update the MySQL driver from 8.0.22 to 8.0.23

* Verify the MySQL driver download to avoid man in the middle attacks

* Fix bug

* Added comment

XDOCKER-131: docker-entrypoint doen't set database

  * Missing update of docker-compose so that the build don't put back
    12.1-alpine

* Also update the compose files

* And switch to AdoptOpenJDK 8.x for XWiki 10.x (since XWiki 10.x doesn't support Java 11)

[Misc] Remove dead code since we don't release Docker images on XWiki 9.x anymore (LTS has moved to 10.x)

XDOCKER-101: Upgrade stable version to 11.2

* Added logic for configuring an external Solr instance using environment variables
* Updated README.md with instructions for using the XWiki image with an external Solr instance
* Added a script, contrib/solr/solr-init.sh, which initializes a Solr container to be usable by XWiki