[CI] Use ccache when prebuilding tests

Signed-off-by: Sarnie, Nick <[email protected]>

Author: sarnex

Diff for: .github/workflows/sycl-linux-build.yml

@@ -280,6 +280,8 @@ jobs:
         binaries_artifact: ${{ inputs.e2e_binaries_artifact }}
         cxx_compiler: $GITHUB_WORKSPACE/toolchain/bin/clang++
         extra_lit_opts: --param sycl_build_targets="spir;nvidia;amd"
+        build_cache_root: ${{ inputs.build_cache_root }}
+        inputs.build_cache_suffix: "${{ inputs.build_cache_suffix }}_e2e"
 
     - name: Remove E2E tests before spirv-backend run
       if: ${{ inputs.e2e_binaries_artifact && always() && !cancelled() && steps.build.conclusion == 'success' }}
@@ -295,3 +297,5 @@ jobs:
         binaries_artifact: ${{ inputs.e2e_binaries_artifact }}_spirv_backend
         cxx_compiler: $GITHUB_WORKSPACE/toolchain/bin/clang++
         extra_lit_opts: --param spirv-backend=True
+        build_cache_root: ${{ inputs.build_cache_root }}
+        inputs.build_cache_suffix: "${{ inputs.build_cache_suffix }}_e2e_spv"

Diff for: devops/actions/run-tests/e2e/action.yml

@@ -17,10 +17,17 @@ inputs:
     required: false
   cxx_compiler:
     required: false
-
+  build_cache_root:
+    required: false
+  build_cache_suffix:
+    type: string
+    required: false
+    default: "default"
 
 runs:
   using: "composite"
+  env:
+
   steps:
   - name: Checkout E2E tests
     uses: ./devops/actions/cached_checkout
@@ -51,6 +58,12 @@ runs:
       if [ -n "$CMAKE_EXTRA_ARGS" ]; then
         echo "opts=$CMAKE_EXTRA_ARGS" >> $GITHUB_OUTPUT
       fi
+      if [ -n "${{ inputs.build_cache_root }}" ]; then
+       echo "opts='$opts -DCMAKE_C_COMPILER_LAUNCHER=ccache -DCMAKE_CXX_COMPILER_LAUNCHER=ccache'" >> $GITHUB_OUTPUT
+       echo "CCACHE_DIR=${{ inputs.build_cache_root }}/build_cache_${{ inputs.build_cache_suffix }}" >> $GITHUB_OUTPUT
+       echo "CCACHE_MAXSIZE=5G" >> $GITHUB_OUTPUT
+       mkdir -p $CCACHE_DIR
+      fi
   - name: Configure E2E tests
     if: inputs.testing_mode != 'run-only'
     shell: bash