Add health check and configure update order

compose.yml

@@ -21,9 +21,16 @@ services:
       - PROXY_ADDRESS_FORWARDING=true
     depends_on:
       - mariadb
+    healthcheck:
+      test: ["CMD", "curl", "http://localhost:8080"]
+      interval: 30s
+      timeout: 10s
+      retries: 10
+      start_period: 1m
     deploy:
       update_config:
         failure_action: rollback
+        order: start-first
       labels:
         - "traefik.enable=true"
         - "traefik.http.routers.keycloak.rule=Host(`id.autonomic.zone`)"