Keep ubuntu-24.04 for the main build workflow

.github/workflows/ResInsightWithCache.yml

@@ -37,8 +37,8 @@ jobs:
               ri-unit-test-path: "ApplicationLibCode/UnitTests/ResInsight-tests",
             }
           - {
-              name: "Ubuntu 26.04 gcc",
-              os: ubuntu-26.04,
+              name: "Ubuntu 24.04 gcc",
+              os: ubuntu-24.04,
               cc: "gcc-14",
               cxx: "g++-14",
               build-python-module: true,
@@ -53,8 +53,8 @@ jobs:
               ri-unit-test-path: "ApplicationLibCode/UnitTests/ResInsight-tests",
             }
           - {
-              name: "Ubuntu 26.04 clang-19",
-              os: ubuntu-26.04,
+              name: "Ubuntu 24.04 clang-19",
+              os: ubuntu-24.04,
               cc: "clang-19",
               cxx: "clang++-19",
               build-python-module: true,
@@ -165,6 +165,11 @@ jobs:
         run: |
           set -e
           
+          # Add LLVM repository
+          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+          echo "deb http://apt.llvm.org/noble/ llvm-toolchain-noble-19 main" | sudo tee /etc/apt/sources.list.d/llvm-19.list
+          echo "deb-src http://apt.llvm.org/noble/ llvm-toolchain-noble-19 main" | sudo tee -a /etc/apt/sources.list.d/llvm-19.list
+          
           # Update package list and install clang-19
           sudo apt-get update --option="APT::Acquire::Retries=3"
           sudo apt-get install --option="APT::Acquire::Retries=3" -y \
@@ -368,7 +373,7 @@ jobs:
   pypi-publish:
     name: Upload release to PyPI
     needs: build
-    runs-on: ubuntu-26.04
+    runs-on: ubuntu-24.04
     environment:
       name: pypi
       url: https://pypi.org/p/rips

.github/workflows/release-draft.yml

@@ -75,7 +75,7 @@ jobs:
           cd artifacts
           for d in ResInsight-*/; do
             name="${d%/}"
-            # Spaces in artifact names (e.g. "ResInsight-Ubuntu 26.04 gcc")
+            # Spaces in artifact names (e.g. "ResInsight-Ubuntu 24.04 gcc")
             # make awkward asset filenames, so collapse them to underscores.
             safe="${name// /_}"
             zip -r "../release-assets/${safe}-${{ github.ref_name }}.zip" "$name"

.github/workflows/test-latest-rips-with-latest-resinsight.yml

@@ -50,9 +50,9 @@ jobs:
               per_page: 100,
             });
 
-            const artifact = artifacts.find((candidate) => candidate.name === "ResInsight-Ubuntu 26.04 gcc");
+            const artifact = artifacts.find((candidate) => candidate.name === "ResInsight-Ubuntu 24.04 gcc");
             if (!artifact) {
-              core.setFailed("Could not find artifact 'ResInsight-Ubuntu 26.04 gcc' on selected run");
+              core.setFailed("Could not find artifact 'ResInsight-Ubuntu 24.04 gcc' on selected run");
               return;
             }