[CI Failure] GitHub artifact upload fails with ENOTFOUND DNS resolution error

## Build Information

Build: https://github.com/microsoft/aspire/actions/runs/31537292983
Build error leg: Tests / Templates-BuildAndRunTemplateTests / Templates-BuildAndRunTemplateTests (macos-latest)
Pull request: #19247

## Error Message

```
Failed to CreateArtifact: Unable to make request: ENOTFOUND
If you are using self-hosted runners, please make sure your runner has access to all GitHub endpoints
```

## Description

GitHub artifact upload fails with ENOTFOUND DNS resolution error

**Type**: infra-failure

## Occurrences

| Date | Build | Job | PR |
|------|-------|-----|----|
| 2026-08-11 | [31537292983](https://github.com/microsoft/aspire/actions/runs/31537292983) | Tests / Templates-BuildAndRunTemplateTests / Templates-BuildAndRunTemplateTests (macos-latest) | #19247 |
| 2026-08-20 | [32311965446](https://github.com/microsoft/aspire/actions/runs/32311965446) | Tests / Build native CLI archive (macOS) / Build CLI (osx-arm64) | #19501 |

Start with the linked workflow runs 31537292983 and 32311965446, especially the named Templates-BuildAndRunTemplateTests and Build native CLI archive jobs, and compare their artifact-upload logs. Check the workflow configuration and runner/network context; done means the macOS jobs can upload artifacts reliably without the ENOTFOUND failure.

Written by the indexing model from the issue text.