Add CI health check

Author: ptoffy

.github/workflows/test.yml

@@ -22,6 +22,11 @@ jobs:
         env:
           discovery.type: single-node
           xpack.security.enabled: false
+        options: >-
+          --health-cmd "curl -f http://localhost:9200/_cluster/health || exit 1"
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 20
     steps:
       - uses: actions/checkout@v6
       - name: Test