Add background task to export suspicious IPs to text file

- Implement export-malicious-ips task that queries distinct IPs flagged
    as is_suspicious from database and writes to exports/malicious_ips.txt
  - Add exports volume mount to docker-compose.yaml for host persistence
  - Update entrypoint.sh to fix ownership of exports directory for krawl user
  - Update Dockerfile to create /app/exports directory during build

Other tasks can be added by creating them in the tasks dir using the same setup as this task.
All tasks *MUST* include a TASK_CONFIG dict and a main method in the file to work correctly.

docker-compose.yaml

@@ -12,6 +12,7 @@ services:
       - ./wordlists.json:/app/wordlists.json:ro
       - ./config.yaml:/app/config.yaml:ro
       - ./logs:/app/logs
+      - ./exports:/app/exports
     environment:
       - CONFIG_LOCATION=config.yaml
     restart: unless-stopped