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supervisor/tests/docker
Stefan Agner d1a576e711 Fix Docker Hub manifest fetching by using correct registry API endpoint (#6525)
The manifest fetcher was using docker.io as the registry API endpoint,
but Docker Hub's actual registry API is at registry-1.docker.io. When
trying to access https://docker.io/v2/..., requests were being redirected
to https://www.docker.com/ (the marketing site), which returned HTML
instead of JSON, causing manifest fetching to fail.

This matches exactly what Docker itself does internally - see
daemon/pkg/registry/config.go:49 where Docker hardcodes
DefaultRegistryHost = "registry-1.docker.io" for registry operations.

Changes:
- Add DOCKER_HUB_API constant for the actual API endpoint
- Add _get_api_endpoint() helper to translate docker.io to
  registry-1.docker.io for HTTP API calls
- Update _get_auth_token() and _fetch_manifest() to use the API endpoint
- Keep docker.io as the registry identifier for naming and credentials
- Add tests to verify the API endpoint translation

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
2026-02-03 19:03:47 +01:00
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