sample URL shown in the web UI for Docker based gateway setup has wrong protocol

[dbutti]

Describe the bug
The sample command shown when editing a location in the GUI for Docker based gateway setup wrongly uses http as protocol scheme for the DEFGUARD_GRPC_URL. It should be HTTPS to avoid confusion.

To Reproduce

1. Go to "Edit location" in the GUI and look for the gateway server setup
   Expected behavior
   The GRPC should be shown with https:// at the beginning. Even better, we could show the real IP address of the GRPC service (if known)

Version information

• Defguard Core version: v0.9.1
• Running as docker container with the official image