ci: update build step in release pipeline to handle new configuration

Also add missing package step to publish extension as an asset.

Author: traunts

.github/workflows/release.yaml

@@ -29,8 +29,11 @@ jobs:
       - name: "Install dependencies"
         run: npm ci
 
-      - name: "Build (ensure yaml is transpiled to json)"
-        run: npm run build
+      - name: "Build syntaxes, client and server. "
+        run: npx nx run-many --target=build
+
+      - name: "Package extension"
+        run: npx vsce package
 
       - name: "Semantic Release"
         run: npx semantic-release