Add label org.opencontainers.image.source="https://github.com/python/cpython" to DOCKERFILE

[marwin1991]

ello, for tools like renovate it is important to have define label org.opencontainers.image.source

So can we add label org.opencontainers.image.source="https://github.com/python/cpython" to DOCKERFILE ?

Base on this label, renovate will provide information about changes.

https://docs.renovatebot.com/modules/datasource/docker/ https://github.com/opencontainers/image-spec/blob/main/annotations.md

[tianon]

See https://github.com/docker-library/cassandra/issues/260