Revive build installers step (#17914)

* Revive build installers step

.azure/pipelines/ci.yml

@@ -117,6 +117,19 @@ stages:
                 $(_BuildArgs)
         displayName: Code sign packages
 
+      # Windows installers bundle both x86 and x64 assets
+      - script: ./build.cmd
+                -ci
+                -sign
+                -buildInstallers
+                /bl:artifacts/log/installers.msbuild.binlog
+                /p:DotNetSignType=$(_SignType)
+                /p:AssetManifestFileName=aspnetcore-win-x64-x86.xml
+                $(_BuildArgs)
+                $(_PublishArgs)
+                /p:PublishInstallerBaseVersion=true
+        displayName: Build Installers
+
       artifacts:
       - name: Windows_Logs
         path: artifacts/log/