Fix etcd health check: use curl instead of etcdctl

etcdctl is not bundled in gcr.io/etcd-development/etcd:v3.5.21 image.
Switch health check to use curl against the /health HTTP endpoint.

Signed-off-by: Aishwarya2001A <aaishwar@progress.com>

Author: Aishwarya2001A

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
         env:
           ETCD_LISTEN_CLIENT_URLS: http://0.0.0.0:2379
           ETCD_ADVERTISE_CLIENT_URLS: http://0.0.0.0:2379
-        options: --health-cmd "ETCDCTL_API=3 etcdctl --endpoints http://localhost:2379 endpoint health" --health-interval 10s --health-timeout 5s --health-retries 5
+        options: --health-cmd "curl -f http://localhost:2379/health" --health-interval 10s --health-timeout 5s --health-retries 5
 
       keystone:
         image: openio/openstack-keystone:pike