ci: Automatically clear caches for closed PRs #13354
Merged
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Taken from https://github.com/actions/cache/blob/main/tips-and-workarounds.md#force-deletion-of-caches-overriding-default-cache-eviction-policy.
Caches are per-branch, so if a PR is closed we do not need to keep any caches for that branch around anymore. This PR adds automation to do just that.