Added files for the docker image

Dockerfile

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+FROM rust:1.69-alpine
+
+RUN mkdir webmention-filer
+COPY src webmention-filer/src
+COPY Cargo.toml webmention-filer/Cargo.toml
+COPY Cargo.lock webmention-filer/Cargo.lock
+
+WORKDIR webmention-filer
+RUN cargo build --release
+
+FROM alpine
+
+COPY /target/release/webmention-filer /usr/bin/
+
+RUN apk add mailx
+
+USER 1000:1000
+EXPOSE 8000
+
+ENTRYPOINT ["/usr/bin/mk-to-atom"]

send-daily-mail.sh

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+#!/bin/sh
+
+yesterday=`date -d 'yesterday' --iso-8601`
+
+echo "/tmp/webmention-storage/$yesterday"
+
+if [ -f "/tmp/webmention-storage/$yesterday" ]
+then
+	 cat "/tmp/webmention-storage/$yesterday" | mail -r $SENDER -s "Your webmentions for $yesterday" $RECIPIENT
+fi