hadolint fixes/best practices added Enable -o pipefail for RUN commands with pipes so any errors in the pipeline cause a failure. use wget -q to reduce log size for large file downloads. Run all apk with --no-cache so I don't need to remove /var/cache/apk/*. Quote variables in RUN shell scripts unless they need to be expanded. Don't use direct variable substitution in printf. Update comment for installing python packages using apk. Remove --use-feature=in-tree-build from local_pip pip command. This feature is the default with newer pips and is now an error if used.

#! /bin/sh

tracker=$(ps -ef | sed -ne '/roundup-server/s/^.*\s\(\w*\)=.*$/\1/p')
wget -q -O /dev/null --no-verbose http://localhost:8080/$tracker/