FROM alpine:latest

# Install necessary packages
RUN apk add --no-cache bash docker-cli curl

# Copy the backup script into the container
COPY backup.sh /usr/local/bin/backup.sh

# Make the script executable
RUN chmod +x /usr/local/bin/backup.sh

# Install cron
RUN apk add --no-cache openrc

# Accept CRON_SCHEDULE as a build argument
ARG CRON_SCHEDULE

# Add the cron job
RUN echo "$CRON_SCHEDULE /usr/local/bin/backup.sh >> /proc/1/fd/1 2>> /proc/1/fd/2" > /etc/crontabs/root

# Start cron in the foreground
CMD ["crond", "-f"]