Add backdoor script to manually hack postgresql database, fixes #187 (#188)

btcpay-admin.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+query()
+{
+    docker exec $(docker ps -a -q -f "name=postgres_1") psql -U postgres -d btcpayservermainnet -c "$*"
+}
+
+case "$1" in
+    reset-u2f)
+        query "SELECT * FROM \"U2FDevices\""
+        query "UPDATE public.\"AspNetUsers\" SET \"TwoFactorEnabled\"=false WHERE upper('\$1') = \"NormalizedEmail\""
+        query "SELECT * FROM \"U2FDevices\""
+        ;;
+    *)
+        echo "Usage: $0 [command]"
+        echo
+        echo "Commands:"
+        echo "         reset-u2f"
+        echo "         reset-u2f"
+esac
+
+exit 0