fix caching of build directory for mac workflow

.github/workflows/macos-build.yml

@@ -44,7 +44,7 @@ jobs:
         uses: pat-s/always-upload-cache@v2.1.3
         if: github.event_name == 'pull_request'
         with:
-          path: /ccache
+          path: ${{ env.CCACHE_DIR }}
           key: build-mac-ccache-${{ github.head_ref }}-${{ github.sha }}
           # The head_ref or source branch of the pull request in a workflow run.
           # The base_ref or target branch of the pull request in a workflow run.
@@ -58,7 +58,7 @@ jobs:
         uses: pat-s/always-upload-cache@v2.1.3
         if: github.event_name != 'pull_request'
         with:
-          path: /ccache
+          path: ${{ env.CCACHE_DIR }}
           # The branch or tag ref that triggered the workflow run. For branches this in the format refs/heads/<branch_name>, and for tags it is refs/tags/<tag_name>
           key: build-mac-ccache-${{ github.ref }}-${{ github.sha }}
           restore-keys: |