f825c72ca2
apk add git downloads from dl-cdn.alpinelinux.org (Fastly CDN) which is
slow/blocked in Iran — caused 6m+ checkout times.
New approach: wget the repo tarball from Gitea's archive API endpoint.
wget + tar (busybox) are already in node:20-alpine — no package install.
Gitea is on the same machine as the runner = download is instant.
GET /api/v1/repos/{owner}/{repo}/archive/{sha}.tar.gz
Authorization: Bearer {token}
dotnet/sdk jobs unchanged — Debian base has git pre-installed.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>