Etcd release image builds have been failing since https://github.com/openshift/cluster-etcd-operator/pull/87 was merged. Looks like there was a paired PR to openshift/release which modified some of the config for the master image builds, but missed updating the release branches.
Builds currently can't find the right dockerfile eg https://prow.svc.ci.openshift.org/view/gcs/origin-ci-test/logs/branch-ci-openshift-cluster-etcd-operator-release-4.4-images/38
2020/02/06 12:06:33 Build cluster-etcd-operator failed, printing logs:
Pulling image "docker-registry.default.svc:5000/ci-op-fsgspppy/pipeline@sha256:7db284329fd3084a7863cd2e2c4713c37d9b3e8fbfc45cdf30d516b31ae5399b" ...
error: open /tmp/build/inputs/Dockerfile: no such file or directory
Checked ci job recently, this issue have not appears, so verify it.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.