Sync etcd from the primary registry

https://github.com/etcd-io/etcd/releases


etcd uses gcr.io/etcd-development/etcd as
a primary container registry, and
quay.io/coreos/etcd as secondary.

Signed-off-by: Spyros Trigazis <spyridon.trigazis@cern.ch>

.gitlab-ci.yml

@@ -73,6 +73,12 @@ k8s.gcr.io/etcd_sync:
   script:
     - ./sync_image.sh "k8s.gcr.io/etcd:3.3.17"
 
+gcr.io/etcd-development/etcd_sync:
+  stage: image_sync
+  image: gitlab-registry.cern.ch/cloud/fedora-buildah:rawhide
+  script:
+    - ./sync_image.sh "gcr.io/etcd-development/etcd:v3.4.7"
+
 quay.io/prometheus/prometheus_sync:
   stage: image_sync
   image: gitlab-registry.cern.ch/cloud/fedora-buildah:rawhide