Added docker environment.

docker/Dockerfile

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+FROM rust:1.57 as builder
+WORKDIR /usr/src/godaddy_ddns
+COPY . .
+RUN cargo install --path .
+
+FROM debian:buster-slim
+
+# Install dependencies.
+RUN apt-get update && \
+    apt-get install -y ca-certificates libssl-dev cron &&  \
+    rm -rf /var/lib/apt/lists/*
+
+# Add application from builder container.
+COPY --from=builder /usr/local/cargo/bin/godaddy_ddns /usr/local/bin/godaddy_ddns
+
+# Add crontab
+COPY --from=builder /usr/src/godaddy_ddns/docker/crontab /etc/cron.d/godaddy_ddns
+RUN chmod 0644 /etc/cron.d/godaddy_ddns
+RUN crontab /etc/cron.d/godaddy_ddns
+
+# Add entrypoint
+COPY --from=builder /usr/src/godaddy_ddns/docker/entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+CMD ["/entrypoint.sh"]

docker/crontab

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+SHELL=/bin/bash
+BASH_ENV=/etc/profile
+PATH="/usr/local/bin:/usr/bin:/bin"
+
+@reboot godaddy_ddns > /proc/1/fd/1 2>/proc/1/fd/2
+*/10 * * * * godaddy_ddns > /proc/1/fd/1 2>/proc/1/fd/2

docker/entrypoint.sh

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+#!/bin/bash
+
+# Export environment variables.
+eval $(printenv | awk -F= '{print "export " "\""$1"\"""=""\""$2"\"" }' >> /etc/profile)
+
+cron -f