support setting log level for backend (#1958)

* support setting log level for backend

* Update backend/bootstrap/main.go

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

---------

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

Author: motatoes

backend/bootstrap/main.go

@@ -247,8 +247,21 @@ func Bootstrap(templates embed.FS, diggerController controllers.DiggerController
 }
 
 func initLogging() {
+	logLevel := os.Getenv("DIGGER_LOG_LEVEL")
+	var level slog.Leveler
+
+	if logLevel == "DEBUG" {
+		level = slog.LevelDebug
+	} else if logLevel == "WARN" {
+		level = slog.LevelWarn
+	} else if logLevel == "ERROR" {
+		level = slog.LevelError
+	} else {
+		level = slog.LevelInfo
+	}
+
 	handler := slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
-		Level: slog.LevelInfo,
+		Level: level,
 	})
 	logger := slog.New(handler)
 	slog.SetDefault(logger)

cli/cmd/digger/default.go

@@ -24,6 +24,8 @@ func initLogger() {
 	var level slog.Leveler
 	if logLevel == "DEBUG" {
 		level = slog.LevelDebug
+	} else if logLevel == "WARN" {
+		level = slog.LevelWarn
 	} else {
 		level = slog.LevelInfo
 	}