docs: Add workflow to publish.

.github/workflows/publish.yml

@@ -0,0 +1,25 @@
+name: Publish
+
+on:
+  workflow_dispatch:
+  pull_request:
+    branches:
+      - main
+    types:
+      - closed
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: Publish to Visual Studio Marketplace
+        uses: HaaLeo/publish-vscode-extension@v1
+        with:
+          pat: ${{ secrets.VS_MARKETPLACE_TOKEN }}
+          registryUrl: https://marketplace.visualstudio.com