Update docker.yml

Author: karimzakzouk

.github/workflows/docker.yml

@@ -98,4 +98,4 @@ jobs:
           push: true
           tags: |
             docker.io/${{ secrets.DOCKER_USERNAME }}/solar-system:${{ github.sha }}
-            ghcr.io/${{ secrets.DOCKER_USERNAME }}/solar-system:${{ github.sha }}
+            ghcr.io/${{ github.repository_owner }}/solar-system:${{ github.sha }}