Remove all GitHub Actions caches for a repository

remove-all-caches.sh

#!/bin/bash
# Requires the "gh" CLI
# https://cli.github.com/

# Install the GitHub Actions cache extension for the GitHub CLI
gh extension install actions/gh-actions-cache
# Purge the 100 oldest cache entries
# (running the script multiple times may cause a rate limit to be hit; this can be solved by waiting a few minutes)
gh actions-cache list -L 100 --sort last-used --order asc | awk '{print $1}' | xargs -d\\n -n1 gh actions-cache delete --confirm