V13: build new backoffice on Azure (#14005)

* add build scripts for new BO so it doesn't run through msbuild

* add node config for max_old_space_size to increase allowed heap size

build/azure-pipelines.yml

@@ -42,6 +42,7 @@ stages:
 
     variables:
       npm_config_cache: $(Pipeline.Workspace)/.npm_client
+      NODE_OPTIONS: --max_old_space_size=16384
     jobs:
       - job: A
         displayName: Build Umbraco CMS
@@ -71,6 +72,12 @@ stages:
               gulpFile: src/Umbraco.Web.UI.Client/gulpfile.js
               targets: coreBuild
               workingDirectory: src/Umbraco.Web.UI.Client
+          - script: npm ci --no-fund --no-audit --prefer-offline
+            workingDirectory:  src/Umbraco.Web.UI.New.Client
+            displayName: Run npm ci
+          - script: npm run build:for:cms
+            displayName: Run New Backoffice Build
+            workingDirectory: src/Umbraco.Web.UI.New.Client
           - task: UseDotNet@2
             displayName: Use .NET $(dotnetVersion)
             inputs: