Update cd-sideload-preview.yml

Author: yaira2

.github/workflows/cd-sideload-preview.yml

@@ -35,6 +35,7 @@ jobs:
       APPX_PACKAGE_DIR:           '${{ github.workspace }}\artifacts\AppxPackages'
       PACKAGE_PROJECT_DIR:        'src\Files.App (Package)'
       PACKAGE_PROJECT_PATH:       'src\Files.App (Package)\Files.Package.wapproj'
+      LAUNCHER_PATH:              'src\Files.App.Launcher\Files.App.Launcher.vcxproj'
       PACKAGE_MANIFEST_PATH:      'src\Files.App (Package)\Package.appxmanifest'
       TEST_PROJECT_PATH:          'tests\Files.InteractionTests\Files.InteractionTests.csproj'
       APP_INSTALLER_SIDELOAD_URL: 'https://cdn.files.community/files/preview/'
@@ -86,6 +87,13 @@ jobs:
         -p:Configuration=$env:CONFIGURATION `
         -p:PublishReadyToRun=true
 
+    - Build launcher project
+      shell: pwsh
+      run: |
+        msbuild "$env:LAUNCHER_PATH" `
+        -p:Platform=$env:PLATFORM `
+        -p:Configuration=$env:CONFIGURATION
+
     - name: Build & package Files
       shell: pwsh
       run: |