somewhat documented API

docker-compose.example.yml

@@ -29,11 +29,9 @@ services:
       - ymariadb:/var/lib/mysql
     healthcheck:
       test: [ "CMD", "healthcheck.sh", "--connect", "--innodb_initialized" ]
-      start_period: 30s
-      start_interval: 10s
       interval: 5s
       timeout: 5s
-      retries: 3
+      retries: 10
 
 volumes:
-  ymariadb:
+  ymariadb: