Added workspace clear between actions checkouts

.github/workflows/doxygen.yml

@@ -47,6 +47,9 @@ jobs:
         # Change the directory if changes in Doxyfile
         publish_dir: ./docs
 
+    - name: Cleanup workspace
+      uses: akiojin/clean-workspace-github-action@v1
+
     - uses: actions/checkout@v3
       with:
         ref: landing-page