fix(infra): nrc-init runs migrations only, not setup_configuration (refs #30)

With OpenZaak now coming up, nrc-init ran for the first time and failed:

  nrc-init-1 | CommandError: No steps enabled, aborting.

NRC's setup_configuration/data.yaml is intentionally empty ({}) — the
OZ<->NRC wiring is deferred to S-06 — but /setup_configuration.sh runs
`manage.py setup_configuration` regardless, and NRC 1.16.1 aborts when no
steps are enabled. (This was masked until now: oz-init failed first, so
openzaak never became healthy and nrc-init, which waits on it, never ran.)

The documented intent is "init runs migrations only", so nrc-init now runs
`manage.py migrate` directly instead of /setup_configuration.sh, and the
dead RUN_SETUP_CONFIG env is dropped from the NRC services. nrc-web still
migrates + creates the superuser itself via /start.sh.

Also:
- Makefile: bump compose `--wait-timeout` 300 -> 420. The serial
  oz-db -> oz-init -> openzaak(healthy) -> nrc-init -> nrc-web(healthy)
  chain runs ~260 s on the runner; 420 s gives comfortable headroom.
- ci.yaml: widen the on-failure log dump to oz-init, openzaak, nrc-init,
  nrc-web, flowable-init, keycloak, acl, bff for full diagnosability.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yaml

@@ -50,7 +50,7 @@ jobs:
       - run: make smoke
       - name: dump container logs on failure
         if: failure()
-        run: docker compose -f infra/docker-compose.yml logs --no-color --tail=100 oz-init nrc-init acl bff 2>&1 || true
+        run: docker compose -f infra/docker-compose.yml logs --no-color --tail=80 oz-init openzaak nrc-init nrc-web flowable-init keycloak acl bff 2>&1 || true
       - name: tear down on failure
         if: failure()
         run: docker compose -f infra/docker-compose.yml down --volumes 2>&1 || true