the patched crond (busybox) can be run as non-root users.
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Sample dockerfile by using this image tag:
FROM geekidea/alpine-cron:3.10
USER nobody
RUN mkdir /tmp/crontabs \
&& echo 'SHELL=/bin/sh' > /tmp/crontabs/nobody \
&& echo '* * * * * /tmp/nobody.sh' >> /tmp/crontabs/nobody \
&& echo 'echo "$(date) blahblahblah nobody" >> /tmp/nb-cron.log' > /tmp/nobody.sh \
&& chmod 0755 /tmp/nobody.sh
CMD ["crond", "-c", "/tmp/crontabs", "-l", "0", "-d", "0", "-f"]
For more: https://github.com/inter169/systs/blob/master/alpine/crond/README.md
docker pull geekidea/alpine-cron