Pins the actcache server to a fixed port (43707) and exposes it, then mounts /mnt/arcodange/gitea-runner-cache and /mnt/arcodange/gitea-runner-act into the runner so the actions/cache and act image layer cache survive container restarts. Moves the runner onto a dedicated `gitea_action_network` so CI job containers can reach the cache server by name without sharing the host network. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>