[9.0] `Alpine320_Offline_PreviousSourceBuiltSdk_x64` failed to download the previous source-built SDK

[Winniexu01]

Failing build (internal Microsoft link)

Prep the Build step failed to extra gz file:

++ tar -ozxf /mnt/vss/_work/1/s/prereqs/packages/archive/dotnet-sdk-9.0.102-alpine.3.20-x64.tar.gz -C /mnt/vss/_work/1/s/.dotnet

gzip: stdin: not in gzip format
tar: Child returned status 1
tar: Error is not recoverable: exiting now

This error is caused by the previous step Setup Previously Source-Built SDK, it failed to download the source-built SDK from https://builds.dotnet.microsoft.com/source-built-artifacts/sdks/dotnet-sdk-9.0.102-alpine.3.20-x64.tar.gz

A step needs to be added to the Setup Previously Source-Built SDK step to check whether the files are downloaded correctly and completely.

[ellahathaway]

It looks like dotnet-sdk-9.0.102-alpine.3.20-x64.tar.gz doesn't exist.

The latest 9.0 release uploaded the alpine 3.19 artifacts because that was the previous-source-built SDK version at the time.

I'm thinking that we're going to have to manually upload the 3.20 artifacts in this case.

@mthalman - since you updated the builds to 3.20 & 3.21, can I get your thoughts on this? dotnet/sdk#45416

[ellahathaway]

This will be inadvertently resolved by #4819

[ellahathaway]

Closing since this was fixed by dotnet/sdk#46068