Make it a OneBranch build

.azure-pipelines/OneBranch.Official.yml

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+# Trigger the build whenever `main` or `rel/*` is updated
+trigger:
+  - main
+  - rel/*
+
+pr: none # Disable PR trigger
+
+# Scheduled nightly build
+schedules:
+  - cron: "0 0 * * *"
+    displayName: Nightly scheduled build
+    always: false # Don't rebuild if there haven't been changes
+    branches:
+      include:
+        - main
+
+# Grab the base templates from https://github.com/microsoft/vscode-azuretools/tree/main/azure-pipelines and OneBranch
+resources:
+  repositories:
+    - repository: templates
+      type: github
+      name: microsoft/vscode-azuretools
+      ref: main
+      endpoint: GitHub
+    - repository: templates
+      type: git
+      name: OneBranch.Pipelines/GovernedTemplates
+      ref: refs/heads/main
+
+# Use those templates
+extends:
+  template: v2/OneBranch.Official.CrossPlat.yml@templates
+  parameters:
+    stages:
+      - template: common-build.yml

.azure-pipelines/common-build.yml

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+stages:
+  - stage: build
+    jobs:
+      - job: main
+        pool:
+          type: windows
+          name: OneBranchPipelines
+        steps:
+          - task: NodeTool@0
+            displayName: Using Node.js
+            inputs:
+              versionSource: fromFile
+              versionFilePath: .nvmrc
+
+          - task: Npm@1
+            displayName: Install Dependencies
+            inputs:
+              command: custom
+              customCommand: ci --no-optional
+
+          - bash: |
+              /usr/bin/Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
+              echo ">>> Started xvfb"
+            displayName: Start X Virtual Frame Buffer
+            condition: and(succeeded(), eq(variables['Agent.OS'], 'Linux'))
+
+          - task: Npm@1
+            displayName: "Build"
+            inputs:
+              command: custom
+              customCommand: run build
+
+          - task: Npm@1
+            displayName: "Package"
+            inputs:
+              command: custom
+              customCommand: run package
+
+          - task: CopyFiles@2
+            displayName: "Copy packages and vsix to staging directory"
+            inputs:
+              Contents: |
+                **/*.vsix
+                **/*.tar.gz
+                **/*.tgz
+              TargetFolder: "$(build.artifactstagingdirectory)/build"
+            condition: and(eq(variables['Agent.OS'], 'Linux'), ne(variables['System.PullRequest.IsFork'], 'True'))
+
+          - task: PublishBuildArtifacts@1
+            displayName: "Publish artifacts: packages and vsix"
+            inputs:
+              PathtoPublish: "$(build.artifactstagingdirectory)/build"
+              ArtifactName: $(artifact_name)
+            condition: and(eq(variables['Agent.OS'], 'Linux'), ne(variables['System.PullRequest.IsFork'], 'True'))