dotnet-install.sh fail with `http_code: unbound variable` when trying to install dotnet

[ericstj]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1103973&view=logs&j=269f5d52-982b-5966-fca9-1b2b0a5feb6e
Build error leg or test failing: Build / wasi-wasm linux Release WasmBuildTests / Build product
Pull request: #117949

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": ["http_code: unbound variable", "workloads-testing.targets"],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1103973
Error message validated: [http_code: unbound variable workloads-testing.targets]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 8/1/2025 4:13:03 PM UTC

Report

Build	Definition	Step Name	Console log	Pull Request
1103973	dotnet/runtime	Build product	Log	#117949

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	1

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/runtime-infrastructure
See info in area-owners.md if you want to be subscribed.

[lewing]

This looks like an issue in dotnet-install.sh

[akoeplinger]

Filed dotnet/install-scripts#626