GITHUB_RUN_NUMBER at Github or
CIRCLE_BUILD_NUM at CircleCI, it would be great Netlify’s build generates and exposes a unique and sequential build number.
This number would begin at 1 for the workflow’s first run, and increments with each new run.
This number wouldn’t change if the workflow run was re-run.
It’s better than build ids (human-readable and sortable) and avoid to manage version number committed to Git (either as text file or tags).