Add image scanning for all Docker containers

[ChristopherSzczyglowski]

Is your feature request related to a problem? Please describe.
We need to make sure all images are checked for security vulnerabilities and best practice.

Describe the solution you'd like
Automated checks during CI and whenever an image is pushed to the external repository.

Describe alternatives you've considered
None - this is best practice

Additional context
Scanning images with docker scan

[ChristopherSzczyglowski]

hadolint is also a good candidate for this.