build: update build action

Author: LastLeaf

.github/workflows/vscode-extension.yml

@@ -14,6 +14,7 @@ jobs:
         with:
           node-version: 20.x
       - run: npm install
+      - run: mkdir -p packages
       - run: npx vsce package -o packages
       - run: npx vsce publish --packagePath packages/*.vsix
         if: success() && startsWith(github.ref, 'refs/tags/')