podman/docs/source/markdown/options/sign-passphrase-file.md

####> This option file is used in: ####> podman manifest push, push ####> If file is edited, make sure the changes ####> are applicable to all of those.

--sign-passphrase-file=path

If signing the image (using either --sign-by or --sign-by-sigstore-private-key), read the passphrase to use from the specified path.