Use env SMTP variables from offical nextcloud image

docker-compose.yml

@@ -32,13 +32,14 @@ services:
       - ./data/config:/var/www/html/config
       - ./data/data:/var/www/html/data
     environment:
-      - MAIL_HOST
-      - MAIL_FROM
-      - MAIL_PASS
-      - MAIL_PORT
+      - SMTP_HOST
+      - SMTP_SECURE
+      - SMTP_AUTHTYPE
+      - SMTP_PASSWORD
+      - SMTP_PORT
+      - SMTP_NAME
       - URL
       - MAIL_DOMAIN
-      - SMTP_NAME
       - MYSQL_DATABASE
       - MYSQL_HOST
       - MYSQL_USER