Devcontainer postgresql (#6590)

* Working on devcontainer with postgresql

* Fix for docker-compose.yml

* Update postCreateCommand

* Tweak docker compose file

* Fix Dockerfile

- Do not use uv (breaks process)

* Update postCreateCommand.sh

- Skip database backup

* Tweak file

* Further improvements

- Remove 'devcontainer' Dockerfile target
- Fix postCreateCommand

* Further cleanup

* Reduce SQL errors

- Use filter().exists() rather than get()

* Set default SITE_URL

* Docs updates

* Fix hard-coded django version

* Update faq.md

* Typo fix: PluginObject -> PluginConfig

* Docs: strict mode

* docs: fix link

* docs: fix typo

* Fix error message

* Revert change to config_template default

.vscode/launch.json

@@ -14,7 +14,7 @@
       "justMyCode": true
     },
     {
-      "name": "Python: Django - 3rd party",
+      "name": "InvenTree Server - 3rd party",
       "type": "python",
       "request": "launch",
       "program": "${workspaceFolder}/InvenTree/manage.py",

.vscode/tasks.json

@@ -45,7 +45,7 @@
     {
       "label": "setup-test",
       "type": "shell",
-      "command": "inv setup-test --path dev/inventree-demo-dataset",
+      "command": "inv setup-test -i --path dev/inventree-demo-dataset",
       "problemMatcher": [],
     },
     {