Function sign_deploy_file 

pub fn sign_deploy_file(
    input_path: &str,
    secret_key_path: &str,
    maybe_output_path: &str,
    force: bool,
) -> Result<(), CliError>

Reads a previously-saved Deploy from a file, cryptographically signs it, and outputs it to a file or stdout.

maybe_output_path specifies the output file path, or if empty, will print it to stdout. If force is true, and a file exists at maybe_output_path, it will be overwritten. If force is false and a file exists at maybe_output_path, crate::Error::FileAlreadyExists is returned and the file will not be written.