fatal: Unable to create 'F:/CIV_CI/CivWebPublish2021_CIVWeb5/CivWebPublish2021/.git/index.lock': File exists.

Another git process seems to be running in this repository, e.g.
an editor opened by 'git commit'. Please make sure all processes
are terminated then try again. If it still fails, a git process
may have crashed in this repository earlier:
remove the file manually to continue.
section_end:1639881350:step_script
section_start:1639881350:cleanup_file_variables
Cleaning up file based variables
section_end:1639881350:cleanup_file_variables
ERROR: Job failed: exit status 1