Providing a Docker image

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Build a docker image for easier setup. Try to use GraalVM as runtime.

• https://github.com/GoogleContainerTools/jib/tree/master/jib-maven-plugin#quickstart
• https://www.graalvm.org/docs/getting-started/#docker-containers

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A docker image is published under https://hub.docker.com/r/camunda/zeebe-script-worker.
Additionally, the repository contains a docker-compose file for a local setup.