Fix default port mapping and indentation

Signed-off-by: Anca Iordache <anca.iordache@docker.com>

nginx-golang-mysql/docker-compose.yaml

@@ -3,27 +3,28 @@ services:
   backend:
     build: backend
     secrets:
-    - db-password
+      - db-password
     depends_on: 
-    - db
+      - db
   db:
-    environment:
-      MYSQL_DATABASE: example
-      MYSQL_ROOT_PASSWORD_FILE: /run/secrets/db-password
-    image: mysql:5.7
+    image: mysql:8.0.19
+    command: '--default-authentication-plugin=mysql_native_password'
     restart: always
     secrets:
-    - db-password
+      - db-password
     volumes:
-    - db-data:/var/lib/mysql
+      - db-data:/var/lib/mysql
+    environment:
+      - MYSQL_DATABASE=example
+      - MYSQL_ROOT_PASSWORD_FILE=/run/secrets/db-password
   proxy:
     build: proxy
     ports:
-    - 80:80
+      - 80:80
     depends_on: 
-    - backend
+      - backend
 volumes:
-  db-data: {}
+  db-data:
 secrets:
   db-password:
     file: db/password.txt