add github action template (#2)

.github/workflows/main.yml

@@ -0,0 +1,35 @@
+on:
+  workflow_dispatch:
+    inputs:
+      publish:
+        description: Whether the extension should be published to the extension registries.
+        type: boolean
+        default: false
+      version:
+        description: The SemVer version for this Build
+        required: true
+        default: "0.0.0"
+        type: string
+
+name: Build and deploy extension
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+      - run: npm ci
+      - run: cd webview-ui && npm ci
+      - name: Publish to Open VSX Registry
+        if: ${{ github.event.inputs.publish == 'true' }}
+        uses: HaaLeo/publish-vscode-extension@v1
+        with:
+          pat: ${{ secrets.OPEN_VSX_TOKEN }}
+      - name: Publish to Visual Studio Marketplace
+        if: ${{ github.event.inputs.publish == 'true' }}
+        uses: HaaLeo/publish-vscode-extension@v1
+        with:
+          pat: ${{ secrets.VS_MARKETPLACE_TOKEN }}
+          registryUrl: https://marketplace.visualstudio.com