v1.8.5 fix flushing issue

hopefully fixing a flushing issue of the webresponse with OpenLiberty

v1.8.4 fixing some resource handling issues

• using try-with-resources block in various locations to prevent resouce leaks
• explicitly close HttpClient connections to free up the underlying sockets

v1.8.3 Fixing server side stackTrace reporting for gradle

Contains a lot of bugfixes for the build:

• fixed multiple warnings
• use github actions
• react to github releases and deploy to github packages
• upgrade to java 1.7 for the build and cactus code base

Fixes the reporting of server side stackTraces in Gradle builds #21