Attempt 5 at doxygen

Author: brofield

.github/workflows/build-doxygen.yml

@@ -13,6 +13,8 @@ jobs:
     steps:
     - name: Checkout code
       uses: actions/checkout@v2
+    - name: Install Doxygen
+      run: sudo apt-get update && sudo apt-get install -y doxygen graphviz
     - name: Generate Doxygen Documentation
       run: doxygen Doxyfile
     - name: Deploy to GitHub Pages