The ExternalSecret had a stale Gitea URL (192.168.8.148:30322 — old
local IP) and runner tokens were never populated in Vault. Update the
template URL to the cluster-internal Gitea service DNS, and store the
registration tokens in Vault at secret/gitea.runner_token.
- external-secrets.yaml: GITEA_INSTANCE_URL changed from cluster-internal
URL to https://git.neuralplatform.ai so runner can register externally
- gitea.yaml: add GITEA__actions__DEFAULT_ACTIONS_URL=gitea so all
actions/* references resolve from gitea.com, not github.com
- Dockerfile: track runner image (Python 3.12 + build deps) in repo