Checking cache for default...
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:1622615648:restore_cache
section_start:1622615648:step_script
Executing "step_script" stage of the job script
Using docker image sha256:0c378f26a54a60cdb35d09947f129744e818eb3c9fed06a844c7272526d65ecb for nixos/nix:latest with digest nixos/nix@sha256:68829d6d28d90aafc7b0cff1b8f95d9dd72815b96d68551e728b58beea37ea75 ...
$ yarn
/bin/sh: eval: line 93: yarn: not found
section_end:1622615649:step_script
section_start:1622615649:cleanup_file_variables
Cleaning up file based variables
section_end:1622615651:cleanup_file_variables
ERROR: Job failed: exit code 127