ci: cache docker layers

Author: anirudhb

.github/workflows/deploy.yml

@@ -45,6 +45,8 @@ jobs:
           context: .
           file: docker/prod-sccache.Dockerfile
           push: true
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           secrets: |