upload-artifact@v4/download-artifact@v4 use the newer Artifact API v2, which Gitea's act_runner doesn't support yet (GHESNotSupportedError). v3 uses the older, Gitea-compatible API.
upload-artifact@v4/download-artifact@v4 use the newer Artifact API v2, which Gitea's act_runner doesn't support yet (GHESNotSupportedError). v3 uses the older, Gitea-compatible API.