- add `testGraphviz`: request `version` as AsciiArt and search for
"Installation seems OK. File generation OK"
- irgnore `testGraphviz` inside github workflow tests except for the
docker container tests, since only in the docker container case
graphviz is available
- add `testMonacoEditorWebJar`: request `loader.js` and check if the
server answers with status code 200
- add a note inside the pom where the webjar versions are hard coded
inside the project
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