Add option to provide configuration file on command line

cmd/dump.go

@@ -26,10 +26,14 @@ It can be used for backup and capture Gogs server image to send to maintainer`,
 	Action: runDump,
 	Flags: []cli.Flag{
 		cli.BoolFlag{"verbose, v", "show process details", ""},
+		cli.StringFlag{"config, c", "custom/conf/app.ini", "Configuration file", ""},
 	},
 }
 
 func runDump(ctx *cli.Context) {
+	if ctx.IsSet("config") {
+		setting.CustomConf = ctx.String("config")
+	}
 	setting.NewConfigContext()
 	models.LoadModelsConfig()
 	models.SetEngine()