Merge "aflags: make flag storage error message more user-friendly" into main

    if !output.status.success() {

        let reason = match output.status.code() {

            Some(code) => {

                format!("exit code {}, output was {}", code, str::from_utf8(&output.stdout)?)

                let output = str::from_utf8(&output.stdout)?;

                if !output.is_empty() {

                    format!("exit code {code}, output was {output}")

                } else {

                    format!("exit code {code}")

                }

            }

            None => "terminated by signal".to_string(),

        };

        bail!("failed to execute device_config: {}", reason);

        bail!("failed to access flag storage: {}", reason);

    }

    Ok(str::from_utf8(&output.stdout)?.to_string())

}