Add a small newc-format cpio encoder that builds an archive with each credential as a file under .extra/system_credentials/<id>.cred and writes it to a temp file. This mirrors what systemd-stub produces from ESP credentials, so PID1's import_credentials_boot() picks them up unchanged via the new /.extra/system_credentials/ initrd path. Motivated by vmspawn under SEV-SNP, where SMBIOS credentials aren't covered by the launch measurement and are discarded by PID1 in confidential guests, so they must be delivered via the measured initrd instead. The writer lives in src/shared/ so other host-side tooling can reuse it. Signed-off-by: Paul Meyer <katexochen0@gmail.com>
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