ci: clean up old Docker preview images #13796

Job	Run time
optimize-ci	4s
detect-changes	4s
Cert-less image E2E test	37s
Lint	18s
Build Windows tests	17s
Test (namespace-profile-mac-default, aarch64-apple-darwin)	8s
Test (Linux x64 musl)	20s
Build Windows CLI binaries	12s
download-previous-rolldown-binaries	14s
Test (namespace-profile-linux-x64-default, x86_64-unknown-linux-gnu)	17s
Docs format check	-1s
CLI E2E test (Linux x64 musl)	13s
CLI snapshot test (x86_64-unknown-linux-gnu)	13s
CLI snapshot test (aarch64-apple-darwin)	7s
Local CLI `vp install` E2E test	-1s
CLI E2E test (namespace-profile-linux-x64-default, x86_64-unknown-linux-gnu)	4s
CLI E2E test (namespace-profile-mac-default, aarch64-apple-darwin)	4s
CLI E2E test (namespace-profile-windows-4c-8g, x86_64-pc-windows-msvc)	4s
Local CLI `vp install` E2E test (Socket Firewall Free)	0s
Test (Windows)	1s
CLI snapshot test (Windows)	1s
done	3s
	3m 19s

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