The web endpoint
`/{owner}/{repo}/actions/runs/{run_id}/artifacts/{artifact_name_or_id}`
can be used with either the artifact name used when it is uploaded or the instance wide unique number of the artifact, if it is not found. For instance:
`/root/myrepo/actions/run/3/artifacts/my_artifact_name`
or
`/root/myrepo/actions/run/3/artifacts/42`
The `upload-artifact@v4` output value `artifact-url` is built in this way and is now a valid URL to access the artifact.
Refs https://codeberg.org/forgejo/forgejo/issues/6147
Refs https://code.forgejo.org/forgejo/runner/issues/187
Refs https://code.forgejo.org/forgejo/upload-artifact/src/tag/v4#outputs
## Checklist
The [contributor guide](https://forgejo.org/docs/next/contributor/) contains information that will be helpful to first time contributors. There also are a few [conditions for merging Pull Requests in Forgejo repositories](https://codeberg.org/forgejo/governance/src/branch/main/PullRequestsAgreement.md). You are also welcome to join the [Forgejo development chatroom](https://matrix.to/#/#forgejo-development:matrix.org).
### Tests
- I added test coverage for Go changes...
- [x] in their respective `*_test.go` for unit tests.
- [x] in the `tests/integration` directory if it involves interactions with a live Forgejo server.
- I added test coverage for JavaScript changes...
- [ ] in `web_src/js/*.test.js` if it can be unit tested.
- [ ] in `tests/e2e/*.test.e2e.js` if it requires interactions with a live Forgejo server (see also the [developer guide for JavaScript testing](https://codeberg.org/forgejo/forgejo/src/branch/forgejo/tests/e2e/README.md#end-to-end-tests)).
### Documentation
- [ ] I created a pull request [to the documentation](https://codeberg.org/forgejo/docs) to explain to Forgejo users how to use this change.
- [x] I did not document these changes and I do not expect someone else to do it.
### Release notes
- [ ] I do not want this change to show in the release notes.
- [x] I want the title to show in the release notes with a link to this pull request.
- [ ] I want the content of the `release-notes/<pull request number>.md` to be be used for the release notes instead of the title.
<!--start release-notes-assistant-->
## Release notes
<!--URL:https://codeberg.org/forgejo/forgejo-->
- Bug fixes
- [PR](https://codeberg.org/forgejo/forgejo/pulls/8957): <!--number 8957 --><!--line 0 --><!--description YXJ0aWZhY3RzIGNhbiBiZSBkb3dubG9hZGVkIHVzaW5nIHRoZWlyIGlkIGluc3RlYWQgb2YgdGhlaXIgbmFtZQ==-->artifacts can be downloaded using their id instead of their name<!--description-->
<!--end release-notes-assistant-->
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8957
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.codeberg.org>
Co-authored-by: Earl Warren <contact@earl-warren.org>
Co-committed-by: Earl Warren <contact@earl-warren.org>
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