NoIssue: A lot of cleanup and generalizations

src/main/docker/Dockerfile_template

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+FROM dockerreg.r35157.com/r35157/jre:_JREVERSION__amd64
+
+LABEL maintainer="Minimons <minimons@r35157.com>"
+
+# Setup environment
+ENV APP_HOME=/usr/local/software/nenjimkicker
+WORKDIR /usr/local/software
+USER root
+
+RUN mkdir nenjimkicker-_VERSION_ \
+    && ln -s nenjimkicker-_VERSION_ nenjimkicker
+WORKDIR nenjimkicker
+RUN mkdir libs
+
+# These dirs are expected to be overshadowed by host mounts
+RUN mkdir conf logs
+
+# Set timezone
+ENV TZ=Europe/Copenhagen
+RUN apt-get update
+RUN apt-get install -y tzdata \
+    && ln -snf /usr/share/zoneinfo/$TZ /etc/localtime \
+    && echo $TZ > /etc/timezone \
+    && dpkg-reconfigure -f noninteractive tzdata
+
+# Clean-up
+RUN apt-get autoremove -y \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install application and configuration (Do this as late as possible to be able to reuse layers between builds)
+COPY start.sh .
+COPY conf/* conf/
+COPY libs/*.jar libs/
+
+RUN chmod 755 ./start.sh \
+    && chmod -R a+rX /usr/local/software/nenjimkicker-_VERSION_
+
+USER user:user
+
+CMD ["./start.sh"]
+

src/main/docker/publish_template.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+echo "Publishing '_HASHTAG_', '_VERSIONTAG_' and '_LATESTTAG_'..."
+docker push _HASHTAG_
+docker push _VERSIONTAG_
+docker push _LATESTTAG_
+
+echo "Publishing completed!"

src/main/docker/start.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+shopt -s nullglob
+
+jars=(libs/*.jar)
+if (( ${#jars[@]} == 0 )); then
+  echo "ERROR: No JARs found in libs/" >&2
+  exit 1
+fi
+
+CLASSPATH=$(IFS=:; echo "${jars[*]}")
+
+exec java \
+  -Dlog4j.configurationFile=/usr/local/software/nenjimkicker/conf/log4j2.xml \
+  -cp "$CLASSPATH" \
+  com.r35157.nenjim.kicker.impl.ref.Main