updated workflow login

Author: imuni4fun

.github/workflows/build.yaml

@@ -24,7 +24,7 @@ jobs:
         uses: docker/login-action@65b78e6e13532edd9afa3aa52ac7964289d1a9c1
         with:
           registry: ghcr.io
-          username: ${{ github.actor }}
+          username: USERNAME
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Extract metadata (tags, labels) for Docker