oss-health doesn't work for github repositories

Although the oss-health package provides pkg:github/Microsoft/DevSkim as an example, this example doesn't appear to work:

root@c9c9c62c8baf:~# oss-health pkg:github/Microsoft/DevSkim

   ____   _____ _____    _____           _            _
  / __ \ / ____/ ____|  / ____|         | |          | |
 | |  | | (___| (___   | |  __  __ _  __| | __ _  ___| |_
 | |  | |\___ \\___ \  | | |_ |/ _` |/ _` |/ _` |/ _ \ __|
 | |__| |____) |___) | | |__| | (_| | (_| | (_| |  __/ |_
  \____/|_____/_____/   \_____|\__,_|\__,_|\__, |\___|\__|
                                            __/ |
                                           |___/          
OSS Gadget - oss-health 0.0.0+23aca19540 - github.com/Microsoft/OSSGadget
INFO  - No repositories were found after searching metadata.
root@c9c9c62c8baf:~# cat oss-gadget.log 
2023/05/19 17:14:59.264|DEBUG|Could not switch output from console to file |
2023/05/19 17:14:59.283|TRACE|ResolvePackageLibraryAsync(pkg:github/microsoft/devskim) |
2023/05/19 17:14:59.288|DEBUG|Searching for source code for: pkg:github/microsoft/devskim |
2023/05/19 17:14:59.291|TRACE|IdentifySourceRepository(pkg:github/microsoft/devskim) |
2023/05/19 17:14:59.291|TRACE|ExtractRankedSourceRepositories(pkg:github/microsoft/devskim) |
2023/05/19 17:14:59.291|INFO|No repositories were found after searching metadata. |
2023/05/19 17:14:59.293|DEBUG|Cannot compute Health for pkg:github/microsoft/devskim |

GITHUB_ACCESS_TOKEN is set with a valid value.

Reproduce the failure with the oss-health pkg:github/Microsoft/DevSkim command and inspect the logged ResolvePackageLibraryAsync, IdentifySourceRepository, and ExtractRankedSourceRepositories entry points. Trace why metadata lookup returns no repositories, then verify that the command resolves the repository and computes health for this package.