Delete all the old workflows that aren't on the `main` branch

gistfile1.txt

user=sli-do repo=slido-global-api; gh api repos/$user/$repo/actions/runs \
--paginate -q '.workflow_runs[] | select(.head_branch != "main") | "\(.id)"' | \
xargs -n1 -I % gh api --silent repos/$user/$repo/actions/runs/% -X DELETE

https://stackoverflow.com/a/64473987

Prerequisites:

You will find the latest gh version here.

Notes:

You may have to gh auth login if this is your first time using it
You may further change the command to gh api --silent if you prefer not to see the verbose output.
For the final xargs part of the command chain - the original used -J instead of -I, which is not supported by GNU xargs. -J results in a single command, and -I will execute the command for each records, so it's a bit slower.