Update main.yml

Author: D3One

.github/workflows/main.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Log in to Docker Hub
         uses: docker/login-action@v3
         with:
-          username: ${{ secrets.DOCKER_USERNAME }}
+          username: ${{ vars.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKER_TOKEN }}
 
       - name: Build and push Docker image