docs: document task caching on github actions cache #13308

Job	Run time
optimize-ci	3s
detect-changes	4s
Docs format check	1m 6s
Lint	0s
Test (Linux x64 musl)	0s
done	3s
Build Windows tests	0s
CLI E2E test (Linux x64 musl)	0s
Test	0s
Build Windows CLI binaries	0s
download-previous-rolldown-binaries	0s
CLI snapshot test (${{ matrix.target }})	0s
Cert-less image E2E test	0s
CLI E2E test	0s
Local CLI `vp install` E2E test (Socket Firewall Free)	0s
Test (Windows)	0s
CLI snapshot test (Windows)	0s
Local CLI `vp install` E2E test	0s
	1m 16s

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