EnvBool reads an environment variable, and if it is set, parses it using [strconv.ParseBool].

EnvDuration reads an environment variable, and if it is set, parses it as a [time.Duration].

EnvFloat reads an environment variable, and if it is set, parses it using [strconv.ParseFloat].

EnvInt reads an environment variable, and if it is set, parses it with [strconv.Atoi].If it is not set, it returns def.

EnvString reads an environment variable, and if it is not set, returns def.

RequireEnvInt reads an environment variable and parses it as a decimal int.

RequireEnvString reads an environment variable, and if it is not set, calls [log.Fatalf].