Need cron to run...cron

context/Dockerfile

@@ -7,7 +7,9 @@ RUN echo "deb http://security.debian.org/ buster/updates main" >> /etc/apt/sourc
 
 RUN apt-get update \
     && apt-get -y --no-install-recommends install \
-        python3 python3-pip \
+        cron \
+        python3 \
+        python3-pip \
     && pip3 install setuptools \
     && pip3 install s3cmd \
     && s3cmd --version \
@@ -20,5 +22,4 @@ RUN apt-get update \
 COPY s3-purge.sh /usr/local/bin/s3-purge
 COPY crontab /etc/cron.d/s3-purge
 
-RUN touch /var/log/s3-purge
-CMD ["tail", "-F", "/var/log/s3-purge"]
+CMD ["cron", "-f"]

context/crontab

-20 1 * * * root s3-purge >> /var/log/s3-purge 2>/dev/null
+20 1 * * * root s3-purge >> /var/log/s3-purge 2>/var/log/s3-purge-err