Added documentation build

Author: TheMostDiligent

.github/workflows/download-and-deploy-artifacts.yml

@@ -14,8 +14,33 @@ jobs:
     name: Ubuntu -> Build
 
     steps:
+    - name: Install Doxygen
+      uses: DiligentGraphics/github-action/install-doxygen@v6
+
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
+
+    - name: Checkout Diligent Engine
+      uses: actions/checkout@v4
+      with:
+        repository: DiligentGraphics/DiligentEngine
+        path:       ${{github.workspace}}/DiligentEngine
+        submodules: true
+
+    - name: Build Documentation
+      working-directory: ${{github.workspace}}/DiligentEngine
+      shell: bash
+      run: |
+        # Build page structure
+        python Doc/md_pages.py Doc/pages.dox
+        # Build documentation
+        mkdir -p build/docs
+        # NB: the build path build/docs is specified in the Doxygen config file
+        doxygen Doc/doxygen.cfg
+        # Move documentation to the root directory
+        mv ${{github.workspace}}/DiligentEngine/build/docs/html ${{github.workspace}}/docs
+        # Remove the source directory
+        rm -rf ${{github.workspace}}/DiligentEngine
 
     - name: Download artifacts
       if: success()