Fix Django Debug Toolbar Visibility and INTERNAL_IPS in Docker Environments

[DavidPacioianu]

Problem: The Django Debug Toolbar does not display in Docker (tested on MacOS) because socket.gethostname() returns Docker's default IP (172.21.0.1), not the host's IP.

Solution: Switch socket.gethostname() to host.docker.internal to accurately reference the host machine's IP from within Docker containers. This change ensures the the host's IP is added to INTERNAL_IPS and the Django debug toolbar is visible when developing in Docker.

[foarsitter]

This might be working on MacOS, but doesn't work on linux:

Python 3.11.7 (main, Feb  1 2024, 05:12:23) [GCC 12.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import socket
>>> socket.gethostbyname_ex("host.docker.internal")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
socket.gaierror: [Errno -2] Name or service not known

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