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

.devcontainer/postCreateCommand.sh

@@ -1,20 +1,14 @@
 #!/bin/bash
 
 # Avoiding Dubious Ownership in Dev Containers for setup commands that use git
-# Note that the local workspace directory is passed through as the first argument $1
-git config --global --add safe.directory $1
-
-# create folders
-mkdir -p $1/dev/{commandhistory,plugins}
-cd $1
+git config --global --add safe.directory /home/inventree
 
 # create venv
-python3 -m venv $1/dev/venv
-. $1/dev/venv/bin/activate
+python3 -m venv /home/inventree/dev/venv --system-site-packages --upgrade-deps
+. /home/inventree/dev/venv/bin/activate
 
 # setup InvenTree server
-pip install invoke
-invoke update
+invoke update -s
 invoke setup-dev
 invoke frontend-install