Extracts all Docker images from Crow CI Pipeline YAML files.

- [Crow CI homepage](https://crowci.dev)
- [Crow CI Docs: Workflow Syntax](https://crowci.dev/latest/usage/workflow-syntax/)
- [Crow CI JSON schema](https://codeberg.org/crowci/crow/raw/branch/main/pipeline/frontend/yaml/linter/schema/schema.go)
