set docker packages username to github.actor

Author: Nebell

.github/workflows/go.yml

@@ -41,7 +41,7 @@ jobs:
       - name: Build and push Docker images
         uses: docker/[email protected]
         with:
-          username: nebell
+          username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
           registry: docker.pkg.github.com
           repository: nebell/go-wechaty-getting-started/dingdongbot