Fix postgresql container (#6610)

- Linked volume caused permission issues

.devcontainer/docker-compose.yml

@@ -7,7 +7,7 @@ services:
     expose:
       - 5432/tcp
     volumes:
-      - ../dev:/var/lib/postgresql/data:z
+      - ../dev/database:/var/lib/postgresql/data:z
     environment:
       POSTGRES_DB: inventree
       POSTGRES_USER: inventree_user

.devcontainer/postCreateCommand.sh

@@ -7,9 +7,13 @@ git config --global --add safe.directory /home/inventree
 python3 -m venv /home/inventree/dev/venv --system-site-packages --upgrade-deps
 . /home/inventree/dev/venv/bin/activate
 
-# setup InvenTree server
+# Run initial InvenTree server setup
 invoke update -s
+
+# Configure dev environment
 invoke setup-dev
+
+# Install required frontend packages
 invoke frontend-install
 
 # remove existing gitconfig created by "Avoiding Dubious Ownership" step