Update docker-publish.yml

Hard code username to hopefully fix login

.github/workflows/docker-publish.yml

@@ -16,6 +16,7 @@ on:
 env:
   # Use docker.io for Docker Hub if empty
   REGISTRY: docker.io
+  REGISTRY_USERNAME: vividboarder
   # github.repository as <account>/<repo>
   IMAGE_NAME: ${{ github.repository }}
   PLATFORMS: linux/amd64,linux/arm,linux/arm64
@@ -60,7 +61,7 @@ jobs:
         uses: docker/login-action@28218f9b04b4f3f62068d7b6ce6ca5b26e35336c
         with:
           registry: ${{ env.REGISTRY }}
-          username: ${{ github.actor }}
+          username: ${{ env.REGISTRY_USERNAME }}
           password: ${{ secrets.REGISTRY_TOKEN }}
 
       # Extract metadata (tags, labels) for Docker