fix: db getting wiped due to hosts permission issue, switches back to named docker maintained volumes (#507)

Author: raghavyuva

docker-compose.yml

@@ -36,7 +36,7 @@ services:
     ports:
       - "${DB_PORT:-5432}:5432"
     volumes:
-      - ${NIXOPUS_HOME:-/etc/nixopus}/db:/var/lib/postgresql/data
+      - nixopus-db-data:/var/lib/postgresql/data
     networks:
       - nixopus-network
     healthcheck:
@@ -126,3 +126,6 @@ services:
 networks:
   nixopus-network:
     driver: bridge
+
+volumes:
+  nixopus-db-data: