FROM alpine:3.21

# Install PostgreSQL client and dcron (lightweight cron daemon)
RUN apk add --no-cache postgresql-client dcron

COPY backup.sh /usr/local/bin/backup.sh
RUN chmod +x /usr/local/bin/backup.sh

# Crontab: run backup daily at 03:00 UTC
RUN echo "0 3 * * * /usr/local/bin/backup.sh >> /var/log/backup.log 2>&1" \
    > /etc/crontabs/root

# crond -f: run in foreground; -l 2: log level notice
CMD ["crond", "-f", "-l", "2"]