Switched default docker base image from openjdk8 to adoptopenjdk11 #2167
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fixes #2156
Unfortunately there exists no openjdk11-alpine image from the openjdk organisation (docker-library/openjdk#235 (comment) docker-library/openjdk#313).
Therefore I decided to switch to the alpine variant of adoptopenjdk. Another approach would be to switch to something like openjdk/11-jdk-slim. My reasoning behind doing it this way was to keep the operation system constant (and good experience with adoptopenjdk). If you prefer the other way around: I am happy to change the PR.