feat: allow switching db engine/version

docker-compose.yml

@@ -54,15 +54,15 @@ services:
 
   db:
     container_name: ${WPSTACK_PROJECT_NAME:-wpstack}-db
-    image: mariadb
+    image: ${DB_ENGINE:-mariadb}:${DB_VERSION:-latest}
     volumes:
       - db_data:/var/lib/mysql
       - ../db:/docker-entrypoint-initdb.d
     environment:
-      MARIADB_RANDOM_ROOT_PASSWORD: true
+      MYSQL_RANDOM_ROOT_PASSWORD: true
-      MARIADB_USER: ${DB_USER}
+      MYSQL_USER: ${DB_USER}
-      MARIADB_PASSWORD: ${DB_PASS}
+      MYSQL_PASSWORD: ${DB_PASS}
-      MARIADB_DATABASE: ${DB_NAME}
+      MYSQL_DATABASE: ${DB_NAME}
     networks:
       - app-network
       - proxy-network