test(etcd): Add etcd test fix, latest container tag no longer available

Author: codexlynx

test/etcd.sh

@@ -3,7 +3,7 @@
 export PASSWORD="supertest"
 
 CONTAINER_ID=$(docker run -d --rm -p 2379:2379 \
-  --name etcd quay.io/coreos/etcd:latest etcd \
+  --name etcd quay.io/coreos/etcd:v3.5.21 etcd \
   --initial-advertise-peer-urls http://0.0.0.0:2380 --listen-peer-urls http://0.0.0.0:2380 \
   --advertise-client-urls http://0.0.0.0:2379 --listen-client-urls http://0.0.0.0:2379 \
   --initial-cluster node1=http://0.0.0.0:2380 \