Generated Django Docker image build fails when installing Python dependencies

[v-ruizh]

OS: Win 11 x64 (DevBox machine)
Build Version: 20260807.1

Repro Steps:

1. Open a Django project django_project.zip in VS Code.
2. Add Docker files.
3. Right-click the Dockerfile and execute "Build Image..." command.
4. Wait for the image build process to complete.

Expect:
The Docker image builds successfully.

Actual:
The image build fails during dependency installation.

More Info:

1. A Windows Security notification is displayed during building the image.
   
2. The same package can be installed successfully on the host machine using python -m pip install django==5.0.1.
3. This issue also reproduces for Flask project.
4. The host machine is configured to use an approved package feed, while the Docker build appears to access files.pythonhosted.org directly.
5. It is unclear whether this is an environment restriction or compatibility/onboarding gap, but the generated Docker image cannot be built successfully in this scenario.

[bwateratmsft]

This is our internal package proxy policy. Need to figure out what to do. The configuration for that is never going to reach the container.

In any case, I do not expect it will affect customers--only us.