Add Dockerfile and docker-based .deb build scripts

Dockerfile

+FROM perl:5.30-slim
+
+COPY bin/ /app/bin/
+COPY lib/ /app/lib/
+COPY Build.PL cpanfile* /app/
+
+WORKDIR /app
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update \
+	&& apt-get -y --no-install-recommends install ca-certificates curl gcc libc6-dev libssl1.1 libssl-dev libxml2 libxml2-dev make zlib1g-dev \
+	&& cpanm -n --no-man-pages --installdeps . \
+	&& perl Build.PL \
+	&& perl Build \
+	&& rm -rf ~/.cpanm \
+	&& apt-get -y purge curl gcc libc6-dev libssl-dev libxml2-dev make zlib1g-dev \
+	&& apt-get -y autoremove \
+	&& apt-get -y clean \
+	&& rm -rf /var/cache/apt/* /var/lib/apt/lists/* 
+
+ENTRYPOINT ["perl", "-Ilib", "bin/efa"]

scripts/makedeb-docker

+#!/bin/sh
+
+mkdir -p out
+
+docker run --rm -v "${PWD}:/orig:ro" -v "${PWD}/scripts:/scripts:ro" \
+	-v "${PWD}/out:/out" -e USER=$(id -u) -e GROUP=$(id -g) \
+	-e "DEBEMAIL=${DEBEMAIL}" -e "DEBFULLNAME=${DEBFULLNAME}" \
+	-e "LOGNAME=${LOGNAME}" -e "VERSION=$(git describe --dirty)-1" \
+	debian:buster /scripts/makedeb-docker-helper
+
+echo "Debian package has been written to $(pwd)/out"

scripts/makedeb-docker-helper

+#!/bin/sh
+
+set -e
+
+export DEBIAN_FRONTEND=noninteractive
+
+apt-get update
+apt-get -y install \
+	apt-file dh-make-perl libmodule-build-perl \
+	libclass-accessor-perl libexception-class-perl libfile-slurp-perl \
+	libwww-perl libxml-libxml-perl \
+	libtest-compile-perl libtest-number-delta-perl libtest-pod-perl \
+	libtest-fatal-perl libtest-simple-perl
+
+apt-file update
+apt-cache dumpavail | dpkg --merge-avail
+
+mkdir -p /src/app
+cp -a /orig/Build.PL /orig/Changelog /orig/README /src/app
+cp -a /orig/bin /orig/lib /orig/t /src/app
+cd /src/app
+
+sed -i 's/sign => 1/sign => 0/' Build.PL
+perl Build.PL
+perl Build
+perl Build manifest
+perl Build dist
+mv Travel-Routing-DE-VRR-*.tar.gz ../app.tar.gz
+dh-make-perl --build --version "${VERSION}"
+chown ${USER}:${GROUP} ../*.deb
+mv -v ../*.deb /out