chore: drop caching

It does not seem to do anyting useful here.

Author: nijel

.github/workflows/docker.yml

@@ -69,7 +69,5 @@ jobs:
         tags: ${{ steps.meta.outputs.tags }}
         labels: ${{ steps.meta.outputs.labels }}
         platforms: linux/amd64,linux/arm64
-        cache-from: type=gha
-        cache-to: type=gha,mode=max
 permissions:
   contents: read