Certbot

certbot/Dockerfile

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+FROM debian:buster-slim
+
+ARG DEBIAN_FRONTEND=noninteractive
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        certbot \
+        python3-certbot-dns-rfc2136 \
+        cron \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY certbot-renew /etc/cron.d/
+
+VOLUME ["/etc/letsencrypt"]
+
+CMD ["cron", "-f"]

certbot/certbot-renew

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+MAILTO=hostmaster
+0 */12 * * * root certbot -q renew