docker-cron/Dockerfile

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# Dockerfile to create image with cron services
FROM ubuntu:latest
# Install Cron
RUN apt-get update \
&& apt-get -y install cron \
&& rm -rf /var/lib/apt/lists/*
RUN useradd test
# Run the command on container startup
CMD crontab -u test /home/test/cron/crontab-file && cron -f