add workflow (#473)

Author: mshr-h

.github/workflows/publish-marketplace.yml

@@ -0,0 +1,20 @@
+on:
+  push:
+    tags:
+      - "*"
+
+name: Publish extension to marketplace
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+      - run: npm ci
+      - name: Publish to Visual Studio Marketplace
+        uses: HaaLeo/publish-vscode-extension@v1
+        with:
+          pat: ${{ secrets.VS_MARKETPLACE_TOKEN }}
+          registryUrl: https://marketplace.visualstudio.com