arch dependent win32 yarn cache

build/azure-pipelines/win32/product-build-win32.yml

@@ -25,6 +25,9 @@ steps:
 
     exec { git config user.email "vscode@microsoft.com" }
     exec { git config user.name "VSCode" }
+
+    mkdir .build -ea 0
+    echo $(VSCODE_ARCH) > .build\arch
   displayName: Prepare tooling
 
 - powershell: |
@@ -37,7 +40,7 @@ steps:
 
 - task: 1ESLighthouseEng.PipelineArtifactCaching.RestoreCacheV1.RestoreCache@1
   inputs:
-    keyfile: '.yarnrc, remote/.yarnrc, **/yarn.lock, !**/node_modules/**/yarn.lock, !**/.*/**/yarn.lock'
+    keyfile: '.build/arch, .yarnrc, remote/.yarnrc, **/yarn.lock, !**/node_modules/**/yarn.lock, !**/.*/**/yarn.lock'
     targetfolder: '**/node_modules, !**/node_modules/**/node_modules'
     vstsFeed: 'npm-vscode'
 
@@ -52,7 +55,7 @@ steps:
 
 - task: 1ESLighthouseEng.PipelineArtifactCaching.SaveCacheV1.SaveCache@1
   inputs:
-    keyfile: '.yarnrc, remote/.yarnrc, **/yarn.lock, !**/node_modules/**/yarn.lock, !**/.*/**/yarn.lock'
+    keyfile: '.build/arch, .yarnrc, remote/.yarnrc, **/yarn.lock, !**/node_modules/**/yarn.lock, !**/.*/**/yarn.lock'
     targetfolder: '**/node_modules, !**/node_modules/**/node_modules'
     vstsFeed: 'npm-vscode'