Add workflow to auto clean cache of closed pr

[loispostula]

PR created automatically!

[github-actions]

poisson_reconstruction - ❌ poisson_reconstruction

(click for details)

required	step	result	details
✓	Custom:	⏭	Logs
✓	cargo fmt --verbose --all -- --check	✅	Logs
✓	cargo check	✅	Logs
✓	cargo clippy -- -D warnings	✅	Logs
	cargo deny check licenses	✅	Logs
	cargo deny check bans	✅	Logs
	cargo deny check advisories	✅	Logs
	cargo deny check sources	✅	Logs
	cargo machete	✅	Logs
✓	cargo test	✅	Logs
	cargo miri test	⏭	Logs
✓	cargo publish --dry-run	❌	Logs

Pushed by: loispostula, Action: pull_request;
Run: 6330213294
Logs: Logs