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provenance: add custom fields support - #6210
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This allows buildkitd daemon to define additional fields that are added to all the provenance attestations that BuildKit creates (by default from /etc/buildkit/provenance.d/). These custom fields can provide additional context about the environment BuildKit itself is running (eg. Github workflow) and are not allowed to collide with the trusted fields created by BuildKit itself. Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
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This was referenced Oct 4, 2025
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This allows buildkitd daemon to define additional fields that are added to all the provenance attestations that BuildKit creates (by default from /etc/buildkit/provenance.d/).
These custom fields can provide additional context about the environment BuildKit itself is running (eg. Github workflow) and are not allowed to collide with the trusted fields created by BuildKit itself.