Function signBomFile

Returns {
    sigFile: string;
    signature: {
        bomSha256: string;
        envelope?: {
            alg: "ed25519";
            fingerprint: string;
            pubkeyB64: string;
            sigB64: string;
            signedTs: number;
            signer: {
                attestationLevel: "SOFTWARE" | "HARDWARE";
                notaryFingerprint?: string;
                type: "VAULT" | "NOTARY";
            };
            v: 1;
        };
        signature: string;
        signedTs: number;
        signer: "auditor";
        v: 1;
    };
}