update de init.sh

docker/docker-compose.yml

         ports: 
             - 3306:3306
         volumes:
-            - gitea-db:/opt/mariadb/backup:/var/lib/mysql
+            - gitea-db:/opt/mysql/data:/var/lib/mysql
         environment:
             MYSQL_ROOT_PASSWORD: 
         restart: unless-stopped

docker/init.sh

     db:
         image: mariadb
         ports: 
-            - 3306:3306
+            - "3306:3306"
         volumes:
-            - gitea-db:/opt/mariadb/backup:/var/lib/mysql
+            - gitea-db:/opt/mysql/data:/var/lib/mysql
         environment:
             MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
         restart: unless-stopped
     gitea-db:
 "> docker-compose.yml
 
-docker-compose up --build -d
+docker-compose up -d