The curl-based install script downloads from raw.githubusercontent.com
which is unreliable in some network environments. go install is more
reliable and uses the Go module proxy.
Mirror of .github/workflows/ci.yml adapted for Gitea Actions:
- Replace golangci-lint-action with direct install script
- Remove upload-artifact (not needed on Gitea)
- Same 4-job structure: lint → test → build → docker
