Add healthcheck for shlink service

docker-compose.yml

@@ -13,6 +13,12 @@ services:
       DB_PASSWORD: ${DB_PASSWORD}
       INITIAL_API_KEY: ${INITIAL_API_KEY}
       TIMEZONE: ${TIMEZONE:-UTC}
+    healthcheck:
+      test: ["CMD-SHELL", "curl -sf http://localhost:8080/rest/health || exit 1"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+      start_period: 30s
     depends_on:
       db:
         condition: service_healthy