docs: Declare Ubuntu 24.04 support and add a note about codejail.

README.rst

@@ -75,6 +75,8 @@ OS:
 
 * Ubuntu 22.04
 
+* Ubuntu 24.04
+
 Interperters/Tools:
 
 * Python 3.11
@@ -107,6 +109,15 @@ Language Packages:
 
   Some Python packages have system dependencies. For example, installing these packages on Debian or Ubuntu will require first running ``sudo apt install python3-dev default-libmysqlclient-dev build-essential pkg-config`` to satisfy the requirements of the ``mysqlclient`` Python package.
 
+Codejail Setup
+--------------
+
+As a part of the baremetal setup, you will need to configure your system to
+work properly with codejail.  See the `codejail installation steps`_ for more
+details.
+
+.. _codejail installation steps: https://github.com/openedx/codejail?tab=readme-ov-file#installation
+
 Build Steps
 -----------