Docker Bench Security hardening

[AaronMcHale]

• Ensure containers are restricted from acquiring new privileges
• Ensure memory usage for container is limited: Container running without memory restrictions
• Ensure CPU priority is set appropriately on the container: Container running without CPU restrictions
• Ensure incoming container traffic is binded to a specific host interface: Port being bound to wildcard IP: 0.0.0.0 in docker-php-drupal-template_nginx_1
• Ensure 'on-failure' container restart policy is set to '5': MaximumRetryCount is not set to 5
• Ensure the container is restricted from acquiring additional privileges
• Add health checks
• Container PID limit