Add release workflow for automatic marketplace publishing (#9)

* Add GitHub Actions workflow for automatic marketplace publishing on tags

* Update .github/workflows/release.yml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Update .github/workflows/release.yml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Add @vscode/vsce as dev dependency and use npx in workflow

* Add missing npx

* Fix version in gh release

* Update .github/workflows/release.yml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: EndlessTrax

.github/workflows/release.yml

@@ -0,0 +1,55 @@
+name: Release Extension
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Get version from tag
+        id: get_version
+        run: echo "VERSION=${GITHUB_REF#refs/tags/v}" >> $GITHUB_OUTPUT
+
+      - name: Verify version matches package.json
+        run: |
+          PACKAGE_VERSION=$(node -p "require('./package.json').version")
+          TAG_VERSION="${{ steps.get_version.outputs.VERSION }}"
+          if [ "$PACKAGE_VERSION" != "$TAG_VERSION" ]; then
+            echo "Error: package.json version ($PACKAGE_VERSION) does not match tag version ($TAG_VERSION)"
+            exit 1
+          fi
+
+      - name: Package extension
+        run: npx vsce package
+
+      - name: Publish to VS Code Marketplace
+        run: npx vsce publish
+        env:
+          VSCE_PAT: ${{ secrets.MARKETPLACE_TOKEN }}
+
+      - name: Create GitHub Release
+        run: |
+          gh release create ${{ github.ref_name }} \
+            --title "Release ${{ github.ref_name }}" \
+            --generate-notes \
+            *.vsix
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}