Add configurable path to database and docker-compose sample

cmd/linkwallet/linkwallet.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"flag"
 	"log"
 
 	"github.com/tardisx/linkwallet/db"
@@ -10,8 +11,19 @@ import (
 
 func main() {
 
+	var dbPath string
+	flag.StringVar(&dbPath, "db-path", "", "path to the database file")
+	flag.Parse()
+
+	if dbPath == "" {
+		log.Fatal("You need to specify the path to the database file with -db-path")
+	}
+
 	dbh := db.DB{}
-	dbh.Open("badger")
+	err := dbh.Open(dbPath)
+	if err != nil {
+		log.Fatal(err)
+	}
 	bmm := db.NewBookmarkManager(&dbh)
 	cmm := db.NewConfigManager(&dbh)