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The tests/Dockerfile was outdated (using an obsolete Ubuntu distribution), and it's not being used by any workflow or prow job. This Dockerfile was the only one using
scripts/install-marker.sh
, which used a vendorized binary generated by the etcd project. This is not needed anymore, as marker releases now provide the binaries.Part of #18059
Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.