No URL provided, cache will not be downloaded from shared cache server. Instead a local version of cache will be extracted. 
Successfully extracted cache
section_end:1641885944:restore_cache
section_start:1641885944:step_script
Executing "step_script" stage of the job script
Using docker image sha256:e2f06f685d895a036edb6391ca014fb7a1d1e6801d95a8d51cdd7af519504eb4 for nixos/nix:latest with digest nixos/nix@sha256:d66c307749b460c054d8edf6191f58ec38c569c8639161d41eb6e4879baf7ff2 ...
$ nix-env -i purescript-0.14.4 -f https://github.com/NixOS/nixpkgs/archive/bed08131cd29a85f19716d9351940bdc34834492.tar.gz
error: selector 'purescript-0.14.4' matches no derivations, maybe you meant:
       purescript
section_end:1641885980:step_script
section_start:1641885980:cleanup_file_variables
Cleaning up project directory and file based variables
section_end:1641885988:cleanup_file_variables
ERROR: Job failed: exit code 1

No URL provided, cache will not be downloaded from shared cache server. Instead a local version of cache will be extracted. 
Successfully extracted cache
section_end:1641885853:restore_cache
section_start:1641885853:step_script
Executing "step_script" stage of the job script
Using docker image sha256:e2f06f685d895a036edb6391ca014fb7a1d1e6801d95a8d51cdd7af519504eb4 for nixos/nix:latest with digest nixos/nix@sha256:d66c307749b460c054d8edf6191f58ec38c569c8639161d41eb6e4879baf7ff2 ...
$ nix-env -i purescript-0.14.4 -f https://github.com/NixOS/nixpkgs/archive/bed08131cd29a85f19716d9351940bdc34834492.tar.gz
error: selector 'purescript-0.14.4' matches no derivations, maybe you meant:
       purescript
section_end:1641885889:step_script
section_start:1641885889:cleanup_file_variables
Cleaning up project directory and file based variables
section_end:1641885896:cleanup_file_variables
ERROR: Job failed: exit code 1