Fix nightly build versioning

[MarcoRossignoli]

@clairernovotny I fixed nightly version.

[MarcoRossignoli]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[MarcoRossignoli]

Need to fix integration test to find new version name.

[clairernovotny]

@MarcoRossignoli you can see how Rx does integration tests here. We use a multi-stage build where artifacts are published in build and then downloaded on multiple platforms:
https://github.com/dotnet/reactive/blob/master/azure-pipelines.rx.yml

I download the artifacts into a directory and then add/update via the dotnet command:
https://github.com/dotnet/reactive/blob/master/azure-pipelines.rx.yml#L169-L175

In all cases NBGV knows what the version is.

[MarcoRossignoli]

Our integration needs to check coverage results https://github.com/tonerdo/coverlet/blob/master/test/coverlet.integration.tests/DotnetTool.cs#L30 or for instance https://github.com/tonerdo/coverlet/blob/master/test/coverlet.integration.tests/Collectors.cs not only run coverage.
Do you have better idea?

[MarcoRossignoli]

Issue related to long path dotnet/sdk#11244