Improve Dockerfile syntax #144
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- Use `set -eux` to have better overview for multi command `RUN`s - Split multiline arguments into one line per argument as defined in dockerfile best practices - Use `export DEBIAN_FRONTEND=noninteractive` just during build. - Make `run.sh` executable, as it's an executable
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set -euxto have better overview for multi commandRUNsexport DEBIAN_FRONTEND=noninteractivejust during build.run.shexecutable, as it's an executableMost syntax is taken from basic dockerfile syntax and the docker base images.