use npmrc for subsequent npm auth

Author: ramsessanchez

.azure-pipelines/common-templates/install-tools.yml

@@ -49,12 +49,17 @@ steps:
       workingFile: $(Build.SourcesDirectory)/autorest.powershell/common/config/rush/.npmrc
 
   - task: PowerShell@2
-    displayName: Set npm userconfig for all npm subprocesses
+    displayName: Apply npm auth config to user profile
     inputs:
       targetType: inline
       pwsh: true
       script: |
-        Write-Host "##vso[task.setvariable variable=NPM_CONFIG_USERCONFIG]$(Build.SourcesDirectory)/.npmrc"
+        # Copy authenticated .npmrc to the user home dir so ALL npm subprocesses
+        # (including autorest's internal npm calls) use the private feed + auth tokens.
+        $src = "$(Build.SourcesDirectory)/.npmrc"
+        $dst = Join-Path $env:USERPROFILE ".npmrc"
+        Copy-Item -Path $src -Destination $dst -Force
+        Write-Host "Copied npm config to $dst"
 
   - task: Npm@1
     displayName: Install AutoRest
@@ -85,5 +90,8 @@ steps:
       workingDirectory: "autorest.powershell"
       script: |
         rush install
+        if ($LASTEXITCODE -ne 0) { throw "rush install failed with exit code $LASTEXITCODE" }
         rush link
-        rush rebuild
+        if ($LASTEXITCODE -ne 0) { throw "rush link failed with exit code $LASTEXITCODE" }
+        rush rebuild
+        if ($LASTEXITCODE -ne 0) { throw "rush rebuild failed with exit code $LASTEXITCODE" }