Added db healthcheck

Signed-off-by: GitHub <noreply@github.com>

nginx-aspnet-mysql/docker-compose.yaml

@@ -8,11 +8,18 @@ services:
       - db
     environment:
       - ASPNETCORE_URLS=http://+:8000
-  
+    depends_on:
+      db:
+        condition: service_healthy
   db:
     image: mysql:8.0.19
     command: '--default-authentication-plugin=mysql_native_password'
     restart: always
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "-h", "127.0.0.1", "--silent"]
+      interval: 3s
+      retries: 5
+      start_period: 30s
     secrets:
       - db-password
     volumes:
@@ -20,6 +27,7 @@ services:
     environment:
       - MYSQL_DATABASE=example
       - MYSQL_ROOT_PASSWORD_FILE=/run/secrets/db-password
+
   proxy:
     build: proxy
     ports: