Starting v4.0, pgvector support is mandatory. This PR adds pgvector
support for new docker installations.
- Switch to postgres images with pgvector support
- Change the default postgres version from `12` to `16`
Fixed an issue where the codespace was not correctly booting up.
Fixes#7609
Co-authored-by: Liam Ashdown <liam.ashdown@debbiesvillas.co.uk>
Co-authored-by: Sojan <sojan@pepalo.com>
