presto-proxy/src/main/java/io/prestosql/proxy/JwtHandlerConfig.java/JwtHandlerConfig/setJwtKeyFile
class JwtHandlerConfig:    @Config("jwt.key-file")
    @ConfigDescription("Key file used for generating JWT signatures")
    public JwtHandlerConfig setJwtKeyFile(File jwtKeyFile)
    {
        this.jwtKeyFile = jwtKeyFile;
        return this;
    }