Fix broken docker workflow (#173)

Author: No767

.github/workflows/docker.yml

@@ -43,6 +43,6 @@ jobs:
           file: ./docker/Dockerfile
           push: true
           cache-from: type=registry,ref=ghcr.io/${{ github.repository_owner }}/rodhaj-build-cache:bot
-          cache-to: cache-to=type=registry,mode=max,ref=ghcr.io/${{ github.repository_owner }}/rodhaj-build-cache:bot
+          cache-to: type=registry,mode=max,ref=ghcr.io/${{ github.repository_owner }}/rodhaj-build-cache:bot
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}