Add Clang 20 image for Ubuntu Noble

Author: bthomee

.github/workflows/ubuntu.yml

@@ -69,6 +69,9 @@ jobs:
           - release: noble
             compiler_name: clang
             compiler_version: 19
+          - release: noble
+            compiler_name: clang
+            compiler_version: 20
     runs-on: ${{ matrix.architecture.runner }}
     permissions:
       packages: write
@@ -175,6 +178,9 @@ jobs:
           - release: noble
             compiler_name: clang
             compiler_version: 19
+          - release: noble
+            compiler_name: clang
+            compiler_version: 20
     runs-on: ubuntu-24.04
     needs:
       - build