CI: disable build-testing on PRs against arm64 (#6341)

CI: disable testing on PRs against arm64

Removed configuration for cublas and arm64 platform.

Signed-off-by: Ettore Di Giacinto <mudler@users.noreply.github.com>

.github/workflows/image-pr.yml

@@ -66,13 +66,3 @@ jobs:
             runs-on: 'ubuntu-latest'
             base-image: "ubuntu:22.04"
             makeflags: "--jobs=4 --output-sync=target"
-          - build-type: 'cublas'
-            cuda-major-version: "12"
-            cuda-minor-version: "0"
-            platforms: 'linux/arm64'
-            tag-latest: 'false'
-            tag-suffix: '-nvidia-l4t-arm64'
-            base-image: "nvcr.io/nvidia/l4t-jetpack:r36.4.0"
-            runs-on: 'ubuntu-24.04-arm'
-            makeflags: "--jobs=4 --output-sync=target"
-            skip-drivers: 'true'