Function add_snp_id_block_command 

pub(crate) fn add_snp_id_block_command(
    input: PathBuf,
    output: PathBuf,
    guest_svn: Option<u32>,
    manifest: Option<PathBuf>,
    id_block: Option<PathBuf>,
    id_signature: Option<PathBuf>,
    id_public_key: Option<PathBuf>,
) -> Result<()>

Add a SEV-SNP ID block to an existing IGVM file, either from an out-of-band signature (production) or signed with an ephemeral key (development/test).