use new docker with 0.18.0-alpha4

Signed-off-by: Anas Nashif <[email protected]>

Author: nashif

.github/workflows/clang.yaml

@@ -18,7 +18,7 @@ jobs:
     runs-on:
       group: zephyr-runner-v2-linux-x64-4xlarge
     container:
-      image: ghcr.io/zephyrproject-rtos/ci-repo-cache:v0.28.0.20250523
+      image: ghcr.io/zephyrproject-rtos/ci-testing:testing-main-amd64
       options: '--entrypoint /bin/bash'
     strategy:
       fail-fast: false

.github/workflows/twister.yaml

@@ -127,7 +127,7 @@ jobs:
     needs: twister-build-prep
     if: needs.twister-build-prep.outputs.size != 0
     container:
-      image: ghcr.io/zephyrproject-rtos/ci-repo-cache:v0.28.0.20250523
+      image: ghcr.io/zephyrproject-rtos/ci-testing:testing-main-amd64
       options: '--entrypoint /bin/bash'
     strategy:
       fail-fast: false