ci: Switch to CI image v0.28.6

This commit updates the CI workflows to use the CI image v0.28.6, which
adds libfuse3 and additional Clang dependencies such as libclang-rt.

Signed-off-by: Stephanos Ioannidis <[email protected]>

Author: stephanosio

.github/workflows/bsim-tests.yaml

@@ -42,7 +42,7 @@ jobs:
     runs-on:
       group: zephyr-runner-v2-linux-x64-4xlarge
     container:
-      image: ghcr.io/zephyrproject-rtos/ci-repo-cache:v0.28.5.20250930
+      image: ghcr.io/zephyrproject-rtos/ci-repo-cache:v0.28.6.20251003
       options: '--entrypoint /bin/bash'
     env:
       ZEPHYR_TOOLCHAIN_VARIANT: zephyr

.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:v0.28.5.20250930
+      image: ghcr.io/zephyrproject-rtos/ci-repo-cache:v0.28.6.20251003
       options: '--entrypoint /bin/bash'
     strategy:
       fail-fast: false

.github/workflows/codecov.yaml

@@ -20,7 +20,7 @@ jobs:
     runs-on:
       group: zephyr-runner-v2-linux-x64-4xlarge
     container:
-      image: ghcr.io/zephyrproject-rtos/ci-repo-cache:v0.28.5.20250930
+      image: ghcr.io/zephyrproject-rtos/ci-repo-cache:v0.28.6.20251003
       options: '--entrypoint /bin/bash'
     strategy:
       fail-fast: false

.github/workflows/doc-build.yml

@@ -59,7 +59,7 @@ jobs:
     runs-on:
       group: zephyr-runner-v2-linux-x64-4xlarge
     container:
-      image: ghcr.io/zephyrproject-rtos/ci-repo-cache:v0.28.5.20250930
+      image: ghcr.io/zephyrproject-rtos/ci-repo-cache:v0.28.6.20251003
       options: '--entrypoint /bin/bash'
     timeout-minutes: 20
     concurrency:

.github/workflows/footprint-tracking.yml

@@ -28,7 +28,7 @@ jobs:
       group: zephyr-runner-v2-linux-x64-4xlarge
     if: github.repository_owner == 'zephyrproject-rtos'
     container:
-      image: ghcr.io/zephyrproject-rtos/ci-repo-cache:v0.28.5.20250930
+      image: ghcr.io/zephyrproject-rtos/ci-repo-cache:v0.28.6.20251003
       options: '--entrypoint /bin/bash'
     defaults:
       run:

.github/workflows/twister.yaml

@@ -128,7 +128,7 @@ jobs:
     needs: twister-build-prep
     if: needs.twister-build-prep.outputs.size != 0
     container:
-      image: ghcr.io/zephyrproject-rtos/ci-repo-cache:v0.28.5.20250930
+      image: ghcr.io/zephyrproject-rtos/ci-repo-cache:v0.28.6.20251003
       options: '--entrypoint /bin/bash'
     strategy:
       fail-fast: false