Microsoft.Graph.Authentication fails to load in Azure Functions with WEBSITE_RUN_AS_PACKAGE

[BHoggs]

Describe the bug
When running The Graph SDK module in Azure functions as a package, the authentication module fails to load, causing all other modules to also fail to load.

ERROR: Could not find file 'C:\home\site\wwwroot\.mg'

I have traced the issue to this line of code:

msgraph-sdk-powershell/src/Authentication/Authentication/Common/GraphSessionInitializer.cs

Line 33 in 8b8b027

Directory.CreateDirectory(Core.Constants.GraphDirectoryPath);

The issue is that when running WEBSITE_RUN_AS_PACKAGE, the user home directory is read-only, so it fails to create the directory.

Workaround
You can work around this issue by creating a .mg directory in the root of your function project.

To Reproduce
Steps to reproduce the behavior:

1. Create an Azure function using the powershell 7 runtime on windows, use EP1 plan. (not consumption)
2. Create a azure powershell function using the VS Code powershell extension
3. Edit requirements.psd1 to include a few v2 Graph modules, including Microsoft.Graph.Authentication
4. Add Import-Module Microsoft.Graph.Authentication somewhere in your function
5. Deploy to function app using VS Code
6. Test function, see errors.

Expected behavior
Module should load without errors

Module Version
2.2.0

Additional context
I'm wondering if #2133 is also related to this issue. Azure automation potentially obfuscating this error?

[BHoggs]

Slight addition from further testing, the reproduction steps only seem to work on a non-consumption app services plan. (used EP1). For whatever reason the error doesn't occur on consumption.