Add GitHub Actions workflow to auto-publish extension on release

.github/PUBLISHING.md

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+# Publishing Guide
+
+This repository includes an automated GitHub Action workflow that publishes the extension to the Visual Studio Marketplace automatically after each release.
+
+## Setup
+
+### Required Secrets
+
+To enable automatic publishing, you need to configure the following secret in your GitHub repository:
+
+1. **MARKETPLACE_PAT**: A Personal Access Token (PAT) for the Visual Studio Marketplace
+
+#### Creating a Marketplace PAT
+
+1. Go to [Visual Studio Marketplace Publisher Management](https://marketplace.visualstudio.com/manage)
+2. Click on your publisher account
+3. Go to "Security" and create a new Personal Access Token
+4. Set the following:
+   - **Name**: GitHub Actions Publishing
+   - **Organization**: All accessible organizations
+   - **Expiration**: Set an appropriate expiration date
+   - **Scopes**: Select "Marketplace (Publish)"
+5. Copy the generated token
+
+#### Adding the Secret to GitHub
+
+1. Go to your GitHub repository
+2. Navigate to Settings → Secrets and variables → Actions
+3. Click "New repository secret"
+4. Name: `MARKETPLACE_PAT`
+5. Value: Paste the token you created
+6. Click "Add secret"
+
+## Workflow Trigger
+
+The workflow is triggered automatically when a new release is published on GitHub.
+
+### Publishing Process
+
+When a release is published:
+
+1. The workflow checks out the code
+2. Sets up Node.js 20
+3. Installs dependencies and builds the task
+4. Installs TFX CLI (Azure DevOps Extension Tool)
+5. Packages the extension
+6. Publishes the extension to the Visual Studio Marketplace
+
+## Manual Publishing
+
+If you need to publish manually, you can:
+
+```bash
+# Install dependencies and build
+cd buildandreleasetask
+npm run build
+cd ..
+
+# Install TFX CLI
+npm install -g tfx-cli
+
+# Package the extension
+mkdir -p ./out
+tfx extension create --manifest-globs vss-extension.json --output-path ./out
+
+# Publish the extension
+tfx extension publish --vsix ./out/*.vsix --auth-type pat --token YOUR_PAT_TOKEN
+```
+
+## Troubleshooting
+
+- **Build Failures**: Check that all dependencies are correctly specified in `package.json`
+- **Publishing Failures**: Verify that the `MARKETPLACE_PAT` secret is correctly configured and has not expired
+- **Version Conflicts**: Ensure the version in `vss-extension.json` and `task.json` is updated before creating a release

.github/workflows/publish-extension.yml

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+name: Publish Extension
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: buildandreleasetask/package-lock.json
+
+      - name: Install dependencies and build task
+        working-directory: buildandreleasetask
+        run: npm run build
+
+      - name: Install TFX CLI
+        run: npm install -g tfx-cli
+
+      - name: Package extension
+        run: |
+          mkdir -p ./out
+          tfx extension create --manifest-globs vss-extension.json --output-path ./out
+          ls -lh ./out/*.vsix
+
+      - name: Publish extension
+        run: tfx extension publish --vsix ./out/*.vsix --auth-type pat --token ${{ secrets.MARKETPLACE_PAT }}