github: workflows: Enable ACL caching for macOS ci

- Upgrade MacOS image to v15.

.github/automation/build_acl.sh

@@ -61,13 +61,19 @@ fi
 echo "Compiler version:"
 $CC --version
 
-set -x
-git clone --branch $ACL_VERSION --depth 1 $ACL_REPO $ACL_ROOT_DIR
-
-cd $ACL_ROOT_DIR
-
-scons $MP Werror=0 debug=$ACL_DEBUG neon=1 opencl=0 embed_kernels=0 \
-    os=$ACL_OS arch=$ACL_ARCH build=native multi_isa=$ACL_MULTI_ISA_SUPPORT \
-    fixed_format_kernels=1 cppthreads=0 openmp=$ACL_OPENMP examples=0 \
-    validation_tests=0
-set +x
+if [[ "$ACL_ACTION" == "clone" ]]; then
+    set -x
+    git clone --branch $ACL_VERSION --depth 1 $ACL_REPO $ACL_ROOT_DIR
+    set +x
+elif [[ "$ACL_ACTION" == "build" ]]; then
+    cd $ACL_ROOT_DIR
+    set -x
+    scons $MP Werror=0 debug=$ACL_DEBUG neon=1 opencl=0 embed_kernels=0 \
+        os=$ACL_OS arch=$ACL_ARCH build=native multi_isa=$ACL_MULTI_ISA_SUPPORT \
+        fixed_format_kernels=1 cppthreads=0 openmp=$ACL_OPENMP examples=0 \
+        validation_tests=0
+    set +x
+else
+    echo "Unknown action: $ACL_ACTION"
+    exit 1
+fi

.github/workflows/ci-aarch64.yml

@@ -36,7 +36,7 @@ permissions: read-all
 jobs:
   macos:
     name: macOS
-    runs-on: macos-14
+    runs-on: macos-15
     strategy:
       matrix:
         toolset: [clang, gcc]
@@ -53,14 +53,49 @@ jobs:
         with:
           packages: scons
 
+      - name: Clone ACL
+        run: ${{ github.workspace }}/oneDNN/.github/automation/build_acl.sh
+        env:
+          ACL_ACTION: clone
+          ACL_CONFIG: ${{ matrix.config }}
+          ACL_ROOT_DIR: ${{ github.workspace }}/ComputeLibrary
+          BUILD_TOOLSET: ${{ matrix.toolset }}
+          GCC_VERSION: 14
+
+      - name: Get ACL commit hash for cache key
+        id: get_acl_commit_hash
+        run: (cd ${{ github.workspace }}/ComputeLibrary && echo "ACLCommitHash=$(git rev-parse --short HEAD)") >> $GITHUB_OUTPUT
+
+      - name: Get system name
+        id: get_system_name
+        run: (echo "SystemName=$(uname)") >> $GITHUB_OUTPUT
+
+      - name: Restore cached ACL
+        id: cache-acl-restore
+        uses: actions/cache/restore@v4
+        with:
+          # Key must have MacOS version to force rebuild when it is updated.
+          key: ${{ steps.get_system_name.outputs.SystemName }}-15-acl-${{ matrix.toolset }}-${{ matrix.config }}-${{ steps.get_acl_commit_hash.outputs.ACLCommitHash }}
+          path: ${{ github.workspace }}/ComputeLibrary/build
+
       - name: Build ACL
+        if:  ${{ steps.cache-acl-restore.outputs.cache-hit != 'true' }}
         run: ${{ github.workspace }}/oneDNN/.github/automation/build_acl.sh
         env:
+          ACL_ACTION: build
           ACL_ROOT_DIR: ${{ github.workspace }}/ComputeLibrary
           BUILD_TOOLSET: ${{ matrix.toolset }}
           ACL_CONFIG: ${{ matrix.config }}
           GCC_VERSION: 14
 
+      - name: Save ACL in cache
+        if:  ${{ steps.cache-acl-restore.outputs.cache-hit != 'true' }}
+        id: cache-acl_build-save
+        uses: actions/cache/save@v4
+        with:
+          key: ${{ steps.cache-acl-restore.outputs.cache-primary-key }}
+          path: ${{ github.workspace }}/ComputeLibrary/build
+
       - name: Build oneDNN
         run: ${{ github.workspace }}/oneDNN/.github/automation/build_aarch64.sh
         working-directory: ${{ github.workspace }}/oneDNN
@@ -69,15 +104,15 @@ jobs:
           BUILD_TOOLSET: ${{ matrix.toolset }}
           CMAKE_BUILD_TYPE: ${{ matrix.config }}
           GCC_VERSION: 14
-
+    
       - if: matrix.toolset == 'clang'
         name: Run oneDNN smoke tests
         run: ${{ github.workspace }}/oneDNN/.github/automation/test_aarch64.sh
         working-directory: ${{ github.workspace }}/oneDNN/build
         env:
           CMAKE_BUILD_TYPE: ${{ matrix.config }}
           DYLD_LIBRARY_PATH: ${{ github.workspace }}/ComputeLibrary/build
-
+  
   # We only run the linux aarch64 runners if macos smoke tests pass.
   linux:
     needs: macos