Autoupdate: implement updating bootstrapper utility (#5204)

.pipelines/build-bootstrapper.cmd

@@ -0,0 +1,10 @@
+cd /D "%~dp0"
+
+call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\Tools\VsDevCmd.bat" -arch=amd64 -host_arch=amd64 -winsdk=10.0.18362.0
+pushd .
+cd ..
+set SolutionDir=%cd%
+popd
+SET IsPipeline=1
+call msbuild ../src/bootstrapper/bootstrapper.vcxproj /p:Configuration=Release /p:Platform=x64 /p:CIBuild=true /p:BuildProjectReferences=false /p:SolutionDir=%SolutionDir%\ || exit /b 1
+

.pipelines/pipeline.user.windows.yml

@@ -132,6 +132,17 @@ build:
             - 'PowerToysSetup-*.msi'
           signing_options:
             sign_inline: true  # This does signing a soon as this command completes
+    - !!buildcommand
+      name: 'Build Power Toys Bootstrapper'
+      command: '.pipelines\build-bootstrapper.cmd'
+      artifacts:
+        - from: 'x64/Release'
+          to: 'Build_Installer_Output'
+          include:
+            - 'PowerToysSetup-*.exe'
+          signing_options:
+            sign_inline: true  # This does signing a soon as this command completes
+
 
 #package:
 #  commands: