remove locks when finishing a job
should fix the issue with old remaining locks, when a job is killed (too long job, after 40 minutes) while it's uploading files to the Hub (lock created with git_branch()).

also: add environment variables in docker compose and helm, add the description in readme, and fix test value
remove locks when finishing a job: should fix the issue with old remaining locks, when a job is killed (too long job, after 40 minutes) while it's uploading files to the Hub (lock created with git_branch()).

also: add environment variables in docker compose and helm, add the description in readme, and fix test value