Enserve is serving this stub because /workspace doesn't contain a Go application yet.
To get started, upload your code via SFTP — the file-manager sidecar
exposes the /workspace volume to the SSH/SFTP gateway. Anything
with a go.mod at the project root will be picked up on the
next Pod restart; go build runs automatically and the resulting
binary becomes the workload.
If you'd rather connect a git repository, edit the Site's
spec.source to add a git.url.