Fix GH workflows

Author: benmcmorran

.github/workflows/build.yml

@@ -72,12 +72,12 @@ jobs:
       - name: Check for linting errors
         run: gulp tslint
       - name: Build and pack extension
-        run: vsce package --out vscode-arduino.vsix
+        run: node build/package.js
       - name: Publish extension VSIX as artifact
         uses: actions/upload-artifact@v2
         with:
-          name: VS Code extension VSIX (${{ matrix.os }})
-          path: vscode-arduino.vsix
+          name: VS Code extension VSIXes (${{ matrix.os }})
+          path: out/vsix
 
       - name: Run tests
         uses: GabrielBB/xvfb-action@v1