Add dockerfile and cron setup for sldl with lsio cron

Dockerfile

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+FROM ghcr.io/linuxserver/baseimage-alpine:3.20
+
+ENV TZ=Etc/GMT
+
+RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
+
+RUN \
+  echo "**** install packages ****" && \
+  apk --no-cache add \
+    binutils-gold  \
+    openssl \
+    zlib \
+    libstdc++ \
+    dotnet6-sdk \
+    aspnetcore6-runtime \
+    bash
+
+ENV DOCKER_MODS=linuxserver/mods:universal-cron
+
+COPY docker/root/ /
+
+WORKDIR /app
+
+COPY --chown=abc:abc . /app
+
+RUN rm -rf /app/docker
+
+RUN dotnet publish -c Release -r linux-x64 -p:PublishSingleFile=true -p:PublishTrimmed=true --self-contained true

docker/root/etc/s6-overlay/s6-rc.d/svc-cron/run

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+#!/usr/bin/with-contenv bash
+
+echo -e "\nStarting cron"
+/usr/sbin/crond -b -S -l 0 -L /config/cron.log

docker/root/etc/s6-overlay/s6-rc.d/svc-cron/type

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+oneshot

docker/root/etc/s6-overlay/s6-rc.d/svc-cron/up

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+/etc/s6-overlay/s6-rc.d/svc-cron/run