Add a comment about Ubuntu 24.04 (#90)

Co-authored-by: jmcarcell <[email protected]>
Co-authored-by: Mateusz Jakub Fila <[email protected]>

docs/getting_started/setup.md

@@ -4,16 +4,16 @@
 
 Two builds with the key4hep stack are distributed on cvmfs. The releases happen
 every few months on demand (for example, if there is a new important feature or
-a breaking change) and at the moment Ubuntu 22.04 and AlmaLinux 9 (EL9,
-RockyLinux9) are supported. We also have older releases for CentOS7 but are not
-making any new builds for that.
+a breaking change) and at the moment AlmaLinux 9 (EL9, Rocky Linux 9), Ubuntu
+22.04 are supported. Some older releases also were built for CentOS7. For
+sourcing the releases, run:
 
 ```bash
 source /cvmfs/sw.hsf.org/key4hep/setup.sh
 ```
 
-In addition, nightly builds for AlmaLinux 9 and Ubuntu 22.04 with the latest
-version of most of the packages are available:
+In addition, nightly builds for AlmaLinux 9, Ubuntu 22.04 and Ubuntu 24.04 with
+the latest version of most of the packages are available:
 
 ```bash
 source /cvmfs/sw-nightlies.hsf.org/key4hep/setup.sh