Users of the template may use `include:rules` to conditionally include /
create the container scanning job, something like:

```yaml
include:
  - component: gitlab.com/components/container-scanning/container-scanning@1.0
    inputs: { ... }
    rules:
      - if: $CONTAINER_SCANNING_DISABLED == null || CONTAINER_SCANNING_DISABLED == 'false'
```

Closes #1