Load loads an optional .env file.

MustBool uses MustString and parses it into a boolean.

MustDuration uses MustString and parses it into a duration.

MustInt uses MustString and parses it into an integer.

MustString returns the content of the environment variable with the given key or the given fallback.

MustStringSlice uses MustString and parses it into a slice of strings.