Fix github workflow

Author: alex-oser

.github/workflows/main.yaml

@@ -13,10 +13,4 @@ jobs:
       - name: test
         run: npm test
       - name: build
-        run: npm run build
-      - name: package
-        run: npm run package
-      - uses: actions/upload-artifact@v2
-        with:
-          name: vscode-tree-extension
-          path: '*.vsix'
+        run: npm run build