drop f39, upgrade ubuntu 20 24.04

README.md

@@ -12,15 +12,15 @@ lots of development packages.  This takes time and lots of bandwidth.
 To speed up the builds, we create Docker images containing a full development
 environment.
 
-The main tests are done in an Ubuntu 22.04 (latest) environment.  
+The main tests are done in an Ubuntu 24.04 (latest) environment.  
 We also perform weekly tests under Fedora.
 
 ## Building
 
 The images are built by more GitHub Actions:
 
-- [ubuntu.yml](.github/workflows/ubuntu.yml) -- Ubuntu 22.04
-- [fedora.yml](.github/workflows/fedora.yml) -- Fedora 39, 40, 41 (rawhide)
+- [ubuntu.yml](.github/workflows/ubuntu.yml) -- Ubuntu 24.04
+- [fedora.yml](.github/workflows/fedora.yml) -- Fedora 40, 41, 42 (rawhide)
 
 Each Action is scheduled to run automaticaly on the 1<sup>st</sup> of the month at 3am.  
 This will ensure we have up-to-date packages for every environment.
@@ -29,8 +29,8 @@ The builds are defined by Dockerfiles:
 
 | Dockerfile                                         | Description         |
 | :------------------------------------------------- | :------------------ |
-| [ubuntu.22.04/Dockerfile](ubuntu.22.04/Dockerfile) | Ubuntu 22.04        |
-| [fedora.39/Dockerfile](fedora.39/Dockerfile)       | Fedora 39           |
+| [ubuntu.24.04/Dockerfile](ubuntu.24.04/Dockerfile) | Ubuntu 24.04        |
 | [fedora.40/Dockerfile](fedora.40/Dockerfile)       | Fedora 40           |
-| [fedora.41/Dockerfile](fedora.41/Dockerfile)       | Fedora 41 (rawhide) |
+| [fedora.41/Dockerfile](fedora.41/Dockerfile)       | Fedora 41           |
+| [fedora.42/Dockerfile](fedora.42/Dockerfile)       | Fedora 42 (rawhide) |
 

ubuntu.22.04/Dockerfile → ubuntu.24.04/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:22.04
+FROM ubuntu:24.04
 
 ENV DEBIAN_FRONTEND=noninteractive