Create build-docfx.yml

.github/workflows/build-docfx.yml

@@ -0,0 +1,51 @@
+name: Build & Publish Docfx
+
+on:
+  push:
+    branches: [ master ]
+    paths:
+      - '**.cs'
+      - '**.csproj'
+      - '**.sln'
+      - '**.git**'
+      - '**.yml'
+      # no docs on which one of these is supposed to work, so
+      # why not just do both
+      - 'RobustToolbox'
+      - 'RobustToolbox/**'
+
+jobs:    
+  docfx:
+   runs-on: ubuntu-latest
+   steps: 
+    - uses: actions/checkout@v2
+    - name: Setup submodule
+      run: |
+        git submodule update --init --recursive
+    - name: Pull engine updates
+      uses: space-wizards/submodule-dependency@v0.1.5
+    - name: Update Engine Submodules
+      run: |
+        cd RobustToolbox/
+        git submodule update --init --recursive
+    - name: Setup .NET Core
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 6.0.x
+        
+    - name: Install dependencies
+      run: dotnet restore
+      
+    - name: Build Project
+      run: dotnet build --no-restore /p:WarningsAsErrors=nullable
+
+    - name: Build DocFX
+      uses: nikeee/docfx-action@v1.0.0      
+      with:
+        args: Content.Docfx/docfx.json
+    
+    - name: Publish Docfx Documentation on GitHub Pages
+      uses: maxheld83/ghpages@master
+      env:
+        BUILD_DIR: Content.Docfx/_content-site 
+        GH_PAT: ${{ secrets.GH_PAT }}