If you are serious about securing container apps then, here is a 8-Point Security Checklist.

Organizations need to think about security through the application stack both before deploying a container and throughout its life cycle. "While containers inherit many of the security features of Linux, there are some specific issues that need to be considered when it comes to the model,"

1. Secrets Management
2. Image Provenances
3. Visibility Into Container Workflow
4. Standardized Configuration and Deployment
5. Discovery and Monitoring 
6. Container-Specific Host OS
7. Container Risk-Prioritization
8. Group Containers

https://www.darkreading.com/cloud/containerized-apps-an-8-point-security-checklist/d/d-id/1332045