fix workflow ref (#640)

Author: jakeloo

.github/workflows/npmPublish.yml

@@ -10,7 +10,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v2
         with:
-          ref: "main"
+          ref: ${{ github.ref }}
 
       - name: Set up Node.js
         uses: actions/setup-node@v2