add health check example

docker-compose.yml

@@ -20,6 +20,12 @@ services:
       - TA_PASSWORD=verysecret              # your initial TA credentials
       - ELASTIC_PASSWORD=verysecret         # set password for Elasticsearch
       - TZ=America/New_York                 # set your time zone
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
+      interval: 2m
+      timeout: 10s
+      retries: 3
+      start_period: 30s
     depends_on:
       - archivist-es
       - archivist-redis