Method logfile

crates/paths/src/server.rs:149–151

`date` should be in UTC.

(self, date: NaiveDate)

impl ModuleLogsDir {
    /// `date` should be in UTC.
    pub fn logfile(self, date: NaiveDate) -> ModuleLogPath {
        ModuleLogPath(self.0.joined(format!("{date}.log")))
    }

    pub fn today(self) -> ModuleLogPath {
        self.logfile(chrono::Utc::now().date_naive())