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

docs/docs/faq.md

@@ -60,7 +60,7 @@ Always activate the virtual environment before running server commands!
 
 ### 'str' object has no attribute 'removeSuffix'
 
-This error occurs because your installed python version is not up to date. We [require Python v3.9 or newer](./start/intro.md#python-requirements)
+This error occurs because your installed python version is not up to date. We [require Python {{ config.extra.min_python_version }} or newer](./start/intro.md#python-requirements)
 
 You (or your system administrator) needs to update python to meet the minimum requirements for InvenTree.