V2 alpha - initial version (#172)

Initial alpha codebase for version 2 of WireGuard Portal.
This version is considered unstable and incomplete (for example, no public REST API)! 
Use with care!


Fixes/Implements the following issues:
 - OAuth support #154, #1 
 - New Web UI with internationalisation support #98, #107, #89, #62
 - Postgres Support #49 
 - Improved Email handling #47, #119 
 - DNS Search Domain support #46 
 - Bugfixes #94, #48 

---------

Co-authored-by: Fabian Wechselberger <wechselbergerf@hotmail.com>

internal/app/cli.go

@@ -0,0 +1,20 @@
+package app
+
+import (
+	"flag"
+	"github.com/h44z/wg-portal/internal/config"
+	"gorm.io/gorm"
+)
+
+func HandleProgramArgs(cfg *config.Config, db *gorm.DB) (exit bool, err error) {
+	migrationSource := flag.String("migrateFrom", "", "path to v1 database file or DSN")
+	migrationDbType := flag.String("migrateFromType", string(config.DatabaseSQLite), "old database type, either mysql, mssql, postgres or sqlite")
+	flag.Parse()
+
+	if *migrationSource != "" {
+		err = migrateFromV1(cfg, db, *migrationSource, *migrationDbType)
+		exit = true
+	}
+
+	return
+}