Update docker-ghcr.yaml

Author: sarperavci

.github/workflows/docker-ghcr.yaml

@@ -12,5 +12,5 @@ jobs:
       - name: Build and publish a Docker image for ${{ github.repository }}
         uses: macbre/push-to-ghcr@master # https://github.com/marketplace/actions/push-to-ghcr
         with:
-          image_name: ${{ github.repository }}  # it will be lowercased internally
+          image_name: ${{ github.repository }}-legacy  # it will be lowercased internally
           github_token: ${{ secrets.GITHUB_TOKEN }}