Enhanced build to pull latest security patches (#6)

* Enhanced build to pull latest security patches
* Slimed down build a little bit
* Added jdk 21

Comment / name tweaks

Update Dockerfile

Merge pull request #4 from xh/tc10Upgrade

Update to tc10.1

Spec `tomcat:9.0.107-jdk11` for 3.2.0 release

README update

- Remove ref to JDK8 builds

Spec `tomcat:9.0-jdk11`

Release v3.2.0 - fix base image to tomcat:9.0.107

Merge branch 'master-jdk17' into develop-jdk17

# Conflicts:
#	CHANGELOG.md
#	Dockerfile

Changelog entry for 3.1.0