Add podman tar for relative symlinks test

[am11]

Test asset for dotnet/runtime#77303.

[akoeplinger]

Where is that file coming from?

[am11]

@akoeplinger, linked issue has details.

[akoeplinger]

Ok but I don't think it should be going into the go test assets directory since it's not from their test suite and that might be confusing.

[am11]

We added docker one in the same spirit last week #279. Since they both use golang, I added it in go directory. I'm open to ideas if you prefer another directory for these. 🙂

[akoeplinger]

I'd just create a separate folder next to golang_tar. The files in that folder are coming from https://github.com/golang/go/tree/master/src/archive/tar/testdata so I think it'd be good to have separation (also license wise)

Btw. looks like there was a new test file added in golang/go@0bf7ee9 that we might want to port too.

[am11]

It's 1MB, I'll compress it with gz (they had it as bz2, which we don't support OOTB).

[akoeplinger]

I don't think 1MB is an issue fwiw

[am11]

I don't think 1MB is an issue fwiw

We don't add huge files in this repo. Majority of files in golang dir are < 20 K.

[tmds]

The tar file from docker added in #279 is an invalid file.
docker (and go <= 1.8) include file type bits which should not be there.
Because it's invalid, that file cannot be generated using the .NET api.

The tar file that gets added here is a valid one.
It is meant to test this branch in the .NET implementation. There is nothing go/podman specific about this.
Rather than adding a file, this archive could be generated by the test using the .NET api.

Personally, I prefer tests generating the archive if possible, as that makes more visible what is special about the archive under test.

[am11]

@akoeplinger, looks like auto-merge got cancelled. can you manually merge?

[akoeplinger]

I didn't yet because @tmds raised a question about generating the file instead, do we want to do that? or are we fine with the checked in file?

[am11]

I think we can do both. This one is for consistency that the podman and docker archives are exercised (these are small files). It will help projects like https://github.com/WeihanLi/nocker to use System.Formats.Tar with confidence.

[akoeplinger]

Ok sounds good.