All services (Gitea, the 3 runners and Portainer itself) are in the
same Docker network 'portainer_default', so the service name 'portainer'
resolves directly from inside any container in that network. The previous
auto-discovery dance with IPs and routes is no longer needed.
- Set the PORTAINER_URL secret to 'http://portainer:9000'.
- Replace the entire 'Step 0' auto-discovery with a simple check that
the configured URL is reachable.
- Drop the debug Step 0a that was added during troubleshooting.
The runner's job container can now reach Portainer the same way the
runner itself does — by name.
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