added docker cron image build environment

dockerfile

@@ -0,0 +1,15 @@
+# Copyright (c) 2023 · Bryan Joshua Pedini
+# LICENSE = gpl3
+# see the LICENSE file for more details
+
+ARG DISTRO
+FROM alpine:${DISTRO}
+
+ARG VERSION
+LABEL maintainer="Bryan Joshua Pedini <b.pedini@bjphoster.com>"
+LABEL version="${VERSION}"
+
+COPY crontab /crontab/root
+COPY docker-entrypoint.sh /docker-entrypoint.sh
+
+ENTRYPOINT [ "/docker-entrypoint.sh" ]