ci(obs): assert obs-loki/prometheus/grafana/tempo are healthy after stack up

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/nightly.yml

@@ -162,6 +162,25 @@ jobs:
             -f /opt/familienarchiv/docker-compose.observability.yml \
             up -d --wait --remove-orphans
 
+      - name: Assert observability stack health
+        # docker compose up --wait covers services WITH healthcheck directives only.
+        # obs-promtail, obs-cadvisor, obs-node-exporter, and obs-glitchtip-worker have
+        # no healthcheck — they are considered "started" as soon as the process runs.
+        # This step explicitly asserts the four healthchecked critical services are
+        # healthy before the smoke test proceeds.
+        run: |
+          set -e
+          unhealthy=""
+          for svc in obs-loki obs-prometheus obs-grafana obs-tempo; do
+            status=$(docker inspect "$svc" --format '{{.State.Health.Status}}' 2>/dev/null || echo "missing")
+            if [ "$status" != "healthy" ]; then
+              echo "::error::$svc is not healthy (status: $status)"
+              unhealthy="$unhealthy $svc"
+            fi
+          done
+          [ -z "$unhealthy" ] || exit 1
+          echo "All critical observability services are healthy"
+
       - name: Reload Caddy
         # Apply any committed Caddyfile changes before smoke-testing the
         # public surface. Without this step, a Caddyfile edit lands in the