Update cd-sideload-stable.yml

Author: Lamparter

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

@@ -88,6 +88,7 @@ jobs:
       shell: pwsh
       run: |
         msbuild "$env:LAUNCHER_PROJECT_PATH" `
+        -t:Build `
         -p:Platform=$env:PLATFORM `
         -p:Configuration=$env:CONFIGURATION `
         -v:quiet