feat(database): support postgres (#43)

Co-authored-by: Li4n0 <[email protected]>

internal/database/postgres.go

@@ -0,0 +1,14 @@
+package database
+
+import (
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+)
+
+func NewPostgres(dsn string) (*gorm.DB, error) {
+	db, err := gorm.Open(postgres.Open(dsn), &gorm.Config{})
+	if err != nil {
+		return nil, err
+	}
+	return db, nil
+}