DROP BEFORE MERGE change base container to nvidia-provided cuda-devel container

Author: dsroberts

.github/workflows/core.yml

@@ -485,7 +485,7 @@ jobs:
     name: Build and test Firedrake (Linux CUDA)
     runs-on: [self-hosted, Linux, gpu]
     container:
-      image: ubuntu:latest
+      image: nvidia/cuda:12.9.1-devel-ubuntu24.04
       options: --gpus all
     if: inputs.test_gpu
     env: