Async validate public container image URLs - #675
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Adds a backend endpoint that checks if a public container image exists by querying the registry's v2 manifest API. Includes a Stimulus controller that debounces input and shows live validation feedback.
Skip async check when the input has a registry host (contains a dot) but no path yet, e.g. "docker.io" or "ghcr.io/". Only fires once a repository path is present.
Extracts image validation into its own namespaced controller at POST /projects/image_validation instead of a collection action on ProjectsController.
Works across all registries without manual auth handling.
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Summary
ContainerRegistry::ImageCheckerservice that validates public images against the registry v2 manifest API (supports Docker Hub auth tokens)POST /projects/validate_imageendpoint returning{ valid, error }image-validationStimulus controller with 500ms debounce, loading spinner, and success/error feedbackTest plan
nginx:latest) and verify the green checkmark appearsdocker.io/nonexistent/image123:v1) and verify the error message