Replace $GITHUB_WORKSPACE with ${{runner.workspace}}.
@@ -26,4 +26,4 @@ jobs:
if: ${{ github.ref == 'refs/heads/master' }}
with:
github_token: ${{ secrets.GITHUB_TOKEN }}
- publish_dir: $GITHUB_WORKSPACE/tools/ci/docs/doxygen/html
+ publish_dir: ${{runner.workspace}}/tools/ci/docs/doxygen/html
