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docs: document how docker datasource resolve sourceUrl #12468

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merged 7 commits into from Nov 8, 2021
5 changes: 5 additions & 0 deletions lib/datasource/docker/readme.md
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This datasource fetches the release note from a source repository specified according to the [pre-defined annotation keys of the OCI Image Format Specification](https://github.com/opencontainers/image-spec/blob/main/annotations.md).
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Namely, it will extract the value of label `org.opencontainers.image.source` if it exist **on the latest stable tags**.
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The [Label Schema](https://label-schema.org/) is now superseded by OCI by annotations, and this datasource does not support the `org.label-schema.vcs-url` label.
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