Build docs when running tests

This ensures docs can be built before actions attempt to build and deploy them

.github/workflows/ctest.yml

@@ -1,4 +1,5 @@
 # This action compiles the library and runs all unit tests using an OS and CMake matrix
+# Doxygen documentation is also built. Build fails on missing documentation.
 name: Unit Tests
 
 on:
@@ -27,19 +28,24 @@ jobs:
     - name: Clone required submodules
       run: |
         git submodule init extern/googletest
+        git submodule init extern/doxygen-awesome-css
         git submodule update
 
     - name: Install CMake
       uses: lukka/get-cmake@latest
       with:
         cmakeVersion: ${{ matrix.cmakeVersion }}
+
+    - name: Install Doxygen
+      uses: ssciwr/doxygen-install@v1
+      with:
+        version: "1.11.0"
 
     - name: "CMake: Build and Test (32-bit)"
       if: matrix.os == 'windows-2019'
       uses: lukka/run-cmake@v10
       with:
         configurePreset: release32
-        configurePresetAdditionalArgs: "['-DBUILD_DOCS=OFF']"
         buildPreset: release32
         testPreset: release32
 
@@ -48,6 +54,5 @@ jobs:
       uses: lukka/run-cmake@v10
       with:
         configurePreset: release64
-        configurePresetAdditionalArgs: "['-DBUILD_DOCS=OFF']"
         buildPreset: release64
         testPreset: release64