Switched from mariadb to postgres for the db container

docker-compose.yml

@@ -1,16 +1,14 @@
 version: '3'
 services:
   nextcloud_db:
-    image: mariadb
-    command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW
+    image: postgres:alpine
     restart: always
     volumes:
-      - ./db:/var/lib/mysql
+      - ./db:/var/lib/postgresql/data
     environment:
-      - MYSQL_ROOT_PASSWORD=hELLO@123
-      - MYSQL_PASSWORD=hELLO@123
-      - MYSQL_DATABASE=nextcloud
-      - MYSQL_USER=nextcloud
+      - "POSTGRES_DB=nextcloud"
+      - "POSTGRES_USER=nextcloud"
+      - "POSTGRES_PASSWORD=nextcloud1"
 
   nextcloud:
     image: nextcloud-ocr