enhancement: modify devcontainer with Ubuntu 24.04 and required build tools

- Install mdl, Python deps and yarn dependencies
- Switch from Debian Bullseye to Ubuntu 24.04 for CI alignment. Fixes Python package compatibility issues (isort installation)

Closes #623

Author: mgajek-cern

.devcontainer/devcontainer.json

@@ -1,6 +1,6 @@
 {
 	"name": "Rucio-Docs",
-	"image": "mcr.microsoft.com/devcontainers/base:bullseye",
+	"image": "mcr.microsoft.com/devcontainers/base:ubuntu-24.04",
 	"features": {
 		"ghcr.io/devcontainers/features/docker-in-docker:2": {
 			"version": "latest",
@@ -10,5 +10,13 @@
 		"ghcr.io/devcontainers/features/node:1": {},
 		"ghcr.io/devcontainers/features/python:1": {},
 		"ghcr.io/devcontainers/features/ruby:1": {}
+	},
+	"postCreateCommand": "gem install mdl && python3 -m pip install --break-system-packages -r tools/requirements.txt pre-commit && cd website && yarn install",
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"davidanson.vscode-markdownlint"
+			]
+		}
 	}
-}
+}

README.md

@@ -8,6 +8,7 @@ links](https://github.com/rucio/documentation/actions/workflows/check_external_l
 This project contains the documentation for the **[Rucio](https://github.com/rucio/rucio)** data-management
 software.
 
+> **Quick Start**: A [devcontainer](.devcontainer/devcontainer.json) is available with all tools pre-installed. Open in IDEs supporting devcontainers (e.g. VS Code with Dev Containers extension).
 
 ## Contribution