Added Dockerfile to build user image

YSFReflector/docker/Dockerfile

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+FROM debian:buster-slim AS builder
+
+RUN apt-get update && \
+    apt-get install -y build-essential git
+
+RUN mkdir /code && \
+    git clone https://github.com/g4klx/YSFClients.git /code && \
+    cd /code/YSFReflector/ && \
+    make clean all
+
+FROM debian:buster-slim
+
+ENV REFLECTOR_NAME set_me
+ENV REFLECTOR_DESCRIPTION set_me
+
+RUN apt-get update && \
+    apt-get install -y procps && \
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* && \
+    mkdir /app
+
+COPY --from=builder /code/YSFReflector/YSFReflector.ini /app/YSFReflector.ini
+COPY --from=builder /code/YSFReflector/YSFReflector /app/YSFReflector
+COPY entrypoint.sh /entrypoint.sh
+
+EXPOSE 42000/udp
+
+ENTRYPOINT ["/entrypoint.sh"]
+CMD ["/app/YSFReflector", "/app/YSFReflector.ini"]
+HEALTHCHECK CMD ps aux | grep [Y]SFReflector || exit 1

YSFReflector/docker/README.md

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+# YSFReflector Docker Image
+
+The `Dockerfile` here is intended to produce an image which will be stored on [Docker Hub](https://hub.docker.com/).
+
+# Requirements
+
+* [Docker](https://docs.docker.com/install/)
+* Firewall setup to accept 42000 (UDP)
+
+# Usage
+
+`docker run -e REFLECTOR_NAME=YOUR_NAME_HERE -eREFLECTOR_DESCRIPTION=YOUR_DESCRIPTION_HERE -p 42000:42000/udp neilbartley/ysfreflector:latest`
+
+# How to build
+
+Building isn't required unless you need a newer image or have made changes.
+
+```
+cd YSFReflector/docker
+YSF_TAG=$(date +'%Y%m%d')-$(git rev-parse --short HEAD)
+docker build --rm -t neilbartley/ysfreflector:$YSF_TAG .
+docker tag neilbartley/ysfreflector:$YSF_TAG neilbartley/ysfreflector:latest
+docker push neilbartley/ysfreflector:$YSF_TAG
+docker push neilbartley/ysfreflector:latest
+```

YSFReflector/docker/entrypoint.sh

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+#!/bin/bash
+
+# Disable daemon mode
+sed -i -e "s/Daemon=1/Daemon=0/g" /app/YSFReflector.ini
+
+# Reflector name and description validation
+if [ "${REFLECTOR_NAME}" == "set_me" ] ; then echo "Please set REFLECTOR_NAME environment variable with -e (max 16 characters)"; exit 1 ; fi
+if [ ${#REFLECTOR_NAME} -gt 16 ] ; then echo "REFLECTOR_NAME environment variable can be at most 16 characters"; exit 1 ; fi
+if [ "${REFLECTOR_DESCRIPTION}" == "set_me" ] ; then echo "Please set REFLECTOR_DESCRIPTION environment variable with -e (min 14 characters)"; exit 1 ; fi
+if [ ${#REFLECTOR_DESCRIPTION} -gt 14 ] ; then echo "REFLECTOR_DESCRIPTION environment variable can be at most 14 characters"; exit 1 ; fi
+
+# Reflector name and description replacement in config file
+sed -i -e "s/Name=.*/Name=${REFLECTOR_NAME}/g" /app/YSFReflector.ini
+sed -i -e "s/Description=.*/Description=${REFLECTOR_DESCRIPTION}/g" /app/YSFReflector.ini
+
+echo "Remember to register your YSFReflector at: https://register.ysfreflector.de"
+
+exec "$@"