Add dockerfile and entrypoint script

Dockerfile

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+FROM golang:alpine as builder
+RUN mkdir /build 
+ADD . /build/
+WORKDIR /build 
+RUN apk add git gcc musl-dev
+RUN go build -o ipe ./cmd
+FROM alpine
+USER root
+RUN  mkdir -p /config
+RUN adduser -S -D -H -h /app appuser
+COPY ./entrypoint.sh /app/entrypoint.sh
+RUN chmod +x /app/entrypoint.sh
+USER appuser
+WORKDIR /app
+COPY --from=builder /build/ipe /app/
+COPY --from=builder /build/config-example.yml /app/config-example.yml
+VOLUME /config
+CMD ["/bin/sh", "/app/entrypoint.sh"]
+EXPOSE 4343
+EXPOSE 8080

entrypoint.sh

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+#!/bin/sh
+if [ -z "$(ls -A /config)" ]; then
+   cp /app/config-example.yml /config/config.yml
+fi
+
+/app/ipe --config=/config/config.yml