$ cachix use w3fpkgs Configured https://w3fpkgs.cachix.org binary cache in /etc/nix/nix.conf $ nix eval .#${CI_JOB_NAME}.outPath | cachix push w3fpkgs warning: Git tree '/builds/florian/w3fpkgs' is dirty error: --- Error --- nix flake 'git+file:///builds/florian/w3fpkgs?shallow=1' does not provide attribute 'packages.x86_64-linux.polkadot-spec.outPath', 'legacyPackages.x86_64-linux.polkadot-spec.outPath' or 'polkadot-spec.outPath' All done. Cleaning up file based variables ERROR: Job failed: command terminated with exit code 1