add initial source

Dockerfile

@@ -0,0 +1,19 @@
+# Copyright 2021 - Offen Authors <hioffen@posteo.de>
+# SPDX-License-Identifier: MIT
+
+FROM alpine:3.13
+
+WORKDIR /root
+
+RUN apk add --update ca-certificates docker openrc gnupg
+RUN rc-update add docker boot
+
+RUN wget https://dl.min.io/client/mc/release/linux-amd64/mc && \
+  chmod +x mc && \
+  mv mc /usr/bin/mc
+
+COPY src/backup.sh src/entrypoint.sh /root/
+RUN chmod +x backup.sh && mv backup.sh /usr/bin/backup \
+  && chmod +x entrypoint.sh
+
+ENTRYPOINT ["/root/entrypoint.sh"]