Add a Dockerfile.

Dockerfile

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+FROM python:3-alpine
+
+ADD requirements.txt /ebooks/
+
+WORKDIR /ebooks/
+VOLUME /ebooks/data/
+
+RUN apk add --virtual .build-deps gcc musl-dev libffi-dev openssl-dev \
+ && pip install -r requirements.txt \
+ && apk del --purge .build-deps \
+ && ln -s data/config.json . \
+ && ln -s data/toots.db .
+
+ADD *.py /ebooks/
+
+RUN (echo "*/30 * * * * cd /ebooks/ && python gen.py"; \
+     echo "5 */2 * * * cd /ebooks/ && python main.py"; \
+     echo "@reboot cd /ebooks/ && python reply.py") | crontab -
+
+ENV ebooks_site=https://botsin.space
+
+CMD (test -f data/config.json || echo "{\"site\":\"${ebooks_site}\"}" > data/config.json) \
+ && (test -f data/toots.db || (python main.py && exit)) \
+ && exec crond -f -L /dev/stdout