Add volume for MariaDB data persistence

Dockerfile

@@ -18,9 +18,8 @@ WORKDIR /app
 RUN apk add --no-cache mariadb mariadb-client mariadb-server-utils nginx
 
 # Initialize MariaDB data directory
-RUN mkdir -p /run/mysqld && \
-    chown -R mysql:mysql /run/mysqld && \
-    chown -R mysql:mysql /var/lib/mysql
+RUN mkdir -p /run/mysqld /var/lib/mysql && \
+    chown -R mysql:mysql /run/mysqld /var/lib/mysql
 
 # Copy MariaDB config
 RUN sed -i 's/\[mysqld\]/[mysqld]\ncharacter-set-server=utf8mb4\ncollation-server=utf8mb4_unicode_ci/' /etc/my.cnf.d/mariadb.cnf || true

docker-compose.yml

@@ -14,4 +14,9 @@ services:
       - DB_NAME=hospital
       - ADMIN_DNI=00000000
       - ADMIN_PASSWORD=Admin123!
+    volumes:
+      - mariadb-data:/var/lib/mysql
     restart: unless-stopped
+
+volumes:
+  mariadb-data: