Ensure that the name of the log file is consistent in the help doc an…

…d in the code.

cmd/main.go

@@ -72,7 +72,7 @@ func Main[B firecore.Block](chain *firecore.Chain[B]) {
 		flags.StringP("config-file", "c", "./firehose.yaml", "Configuration file to use. No config file loaded if set to an empty string.")
 
 		flags.String("log-format", "text", "Format for logging to stdout. Either 'text' or 'stackdriver'")
-		flags.Bool("log-to-file", true, "Also write logs to {data-dir}/firehose.log.json ")
+		flags.Bool("log-to-file", true, fmt.Sprintf("Also write logs to {data-dir}/%s ", launcher.DefaultLogFile))
 		flags.String("log-level-switcher-listen-addr", "localhost:1065", cli.FlagDescription(`
 			If non-empty, a JSON based HTTP server will listen on this address to let you switch the default logging level
 			of all registered loggers to a different one on the fly. This enables switching to debug level on

launcher/logging.go

@@ -21,6 +21,8 @@ import (
 	"go.uber.org/zap"
 )
 
+const DefaultLogFile = "app.log.json"
+
 type LoggingOptions struct {
 	WorkingDir    string // the folder where the data will be stored, in our case will be used to store the logger
 	Verbosity     int    // verbosity level
@@ -50,7 +52,7 @@ func SetupLogger(rootLogger *zap.Logger, opts *LoggingOptions) {
 	}
 
 	if opts.LogToFile {
-		options = append(options, logging.WithOutputToFile(filepath.Join(opts.WorkingDir, "app.log.json")))
+		options = append(options, logging.WithOutputToFile(filepath.Join(opts.WorkingDir, DefaultLogFile)))
 	}
 
 	logging.InstantiateLoggers(options...)