Set up continuous integration for WinUI 3 app

.github/workflows/main.yml

@@ -0,0 +1,61 @@
+# This workflow will build and publish a WinUI 3 unpackaged desktop application
+# built on .NET.
+
+name: WinUI 3 unpackaged app
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+
+  build:
+
+    strategy:
+      matrix:
+        configuration: [Release]
+        platform: [x64, x86]
+
+    runs-on: windows-latest  # For a list of available runner types, refer to
+                             # https://help.github.com/en/actions/reference/workflow-syntax-for-github-actions#jobsjob_idruns-on
+
+    env:
+      Solution_Name: REZ.sln                         # Replace with your solution name, i.e. App1.sln.
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+
+    # Install the .NET Core workload
+    - name: Install .NET Core
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 7.0.x
+
+    # Add  MSBuild to the PATH: https://github.com/microsoft/setup-msbuild
+    - name: Setup MSBuild.exe
+      uses: microsoft/setup-msbuild@v1.0.2
+
+    # Restore the application to populate the obj folder with RuntimeIdentifiers
+    - name: Restore the application
+      run: msbuild $env:Solution_Name /t:Restore /p:Configuration=$env:Configuration
+      env:
+        Configuration: ${{ matrix.configuration }}
+
+    # Create the app by building and publishing the project
+    - name: Create the app
+      run: msbuild $env:Solution_Name /t:Publish /p:Configuration=$env:Configuration /p:Platform=$env:Platform
+      env:
+        Configuration: ${{ matrix.configuration }}
+        Platform: ${{ matrix.platform }}
+
+    # Upload the app
+    - name: Upload app
+      uses: actions/upload-artifact@v2
+      with:
+        name: Upload app
+        path: ${{ env.Solution_Name }}\\bin