ci : do not allocate ccache for 3rd-party hosted runners (#23730)

* ci : do not allocate ccache for 3rd-party hosted runners

[no release]

* cont : add prints

[no ci]
[no release]

.github/workflows/build.yml

@@ -516,51 +516,3 @@ jobs:
          id: ggml-ci
          run: |
            GG_BUILD_KLEIDIAI=1 GG_BUILD_EXTRA_TESTS_0=1 bash ./ci/run.sh ./tmp/results ./tmp/mnt
-
-  ggml-ci-arm64-cpu-kleidiai-graviton4:
-     runs-on: ah-ubuntu_22_04-c8g_8x
-
-     steps:
-       - name: Clone
-         id: checkout
-         uses: actions/checkout@v6
-
-       - name: Dependencies
-         id: depends
-         run: |
-           set -euxo pipefail
-           sudo apt-get update
-           sudo DEBIAN_FRONTEND=noninteractive NEEDRESTART_MODE=a \
-           apt-get install -y \
-            build-essential \
-            python3-venv \
-            gpg \
-            wget \
-            time \
-            git-lfs
-
-           git lfs install
-
-           # install the latest cmake
-           sudo install -d /usr/share/keyrings
-           wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc \
-            | gpg --dearmor \
-            | sudo tee /usr/share/keyrings/kitware-archive-keyring.gpg >/dev/null
-           echo 'deb [signed-by=/usr/share/keyrings/kitware-archive-keyring.gpg] https://apt.kitware.com/ubuntu/ jammy main' \
-            | sudo tee /etc/apt/sources.list.d/kitware.list
-           sudo apt-get update
-           sudo apt-get install -y cmake
-
-       - name: ccache
-         uses: ggml-org/ccache-action@v1.2.21
-         with:
-           key: ggml-ci-arm64-cpu-kleidiai-graviton4
-           evict-old-files: 1d
-           save: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}
-
-       - name: Test
-         id: ggml-ci
-         run: |
-           GG_BUILD_KLEIDIAI=1 \
-           GG_BUILD_EXTRA_TESTS_0=1 \
-           bash ./ci/run.sh ./tmp/results ./tmp/mnt