implement docker cron job

Dockerfile

@@ -0,0 +1,39 @@
+# Use Ubuntu 20.04 as the base image
+FROM ubuntu:20.04
+
+# Install dependencies
+RUN apt-get update && apt-get install -y \
+    sqlite3 \
+    awscli \
+    cron \
+    tar \
+    gzip \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create necessary directories
+RUN mkdir -p /jobs/data/sqlite
+RUN mkdir -p /var/tmp
+
+# Copy the backup script into the container
+COPY backup_sqlite.sh /usr/local/bin/backup_script.sh
+
+# Make the script executable
+RUN chmod +x /usr/local/bin/backup_script.sh
+
+# Create the cron log file
+RUN touch /var/log/cron.log
+
+# Copy the cron job file into the cron.d directory
+COPY backup_cron /etc/cron.d/backup_cron
+
+# Set permissions for the cron job file
+RUN chmod 0644 /etc/cron.d/backup_cron
+
+# Apply the cron job
+RUN crontab /etc/cron.d/backup_cron
+
+# Expose the cron log file as a volume
+VOLUME /var/log
+
+# Start cron in the foreground when the container starts
+CMD ["cron", "-f"]