chore!(amneziawg): refactor to be separate from wireguard

- amneziawg is now a VPN protocol and no longer a Wireguard implementation
- Use it with VPN_TYPE=amneziawg
- document AMNEZIAWG_* options in Dockerfile
- document amneziawg support in readme
- separate amneziawg settings and code from wireguard
- re-use code from wireguard whenever possible

internal/vpn/run.go

@@ -33,14 +33,21 @@ func (l *Loop) Run(ctx context.Context, done chan<- struct{}) {
 		var connection models.Connection
 		var err error
 		subLogger := l.logger.New(log.SetComponent(settings.Type))
-		if settings.Type == vpn.OpenVPN {
+		switch settings.Type {
+		case vpn.AmneziaWg:
+			vpnInterface = settings.AmneziaWg.Wireguard.Interface
+			vpnRunner, connection, err = setupAmneziaWg(ctx, l.netLinker, l.fw,
+				providerConf, settings, l.ipv6Supported, subLogger)
+		case vpn.OpenVPN:
 			vpnInterface = settings.OpenVPN.Interface
 			vpnRunner, connection, err = setupOpenVPN(ctx, l.fw,
 				l.openvpnConf, providerConf, settings, l.ipv6Supported, l.cmder, subLogger)
-		} else { // Wireguard
+		case vpn.Wireguard:
 			vpnInterface = settings.Wireguard.Interface
 			vpnRunner, connection, err = setupWireguard(ctx, l.netLinker, l.fw,
 				providerConf, settings, l.ipv6Supported, subLogger)
+		default:
+			panic("vpn type not implemented: " + settings.Type)
 		}
 		if err != nil {
 			l.crashed(ctx, err)