dotnet template should include a volume mount for nuget package caching

[carlin-q-scott]

Each time the container starts, all nuget packages need to be restored. The package and http caches should be persisted in volume mounts.

	"mounts": [
		"source=NuGetLocal,target=/home/vscode/.local,type=volume",
		"source=NuGet,target=/home/vscode/.nuget,type=volume"
	],
        "postCreateCommand": "chown vscode /home/vscode/.nuget /home/vscode/.local"

I don't totally understand the rhyme or reason for these two folders used by NuGet. They both contain configuration and caches, but of different kinds.

I also don't fully grasp how the mount system is supposed to work because the mounted volumes are owned by root instead of vscode by default, so I have to run chown as a postBuild script. At least this is in the documentation.

[eljog]

It appears that your container user is a non-root user that is different from the host user who owns the Nuget directories. That is the reason why the documentation suggests to run the chown command, so that the container user can access the files.

As the documentation suggests:

This second step is not required if you will be running in the container as root.