Fix CI boot check take 4: 30s timeout too short under CI load

Confirmed via a real run's own docker logs: the container actually
booted successfully (migrations + 4 uvicorn workers, "Application
startup complete") but took just over 30s under this runner's
resource contention (capacity 2 -- another job's build often runs
concurrently), where the same boot takes ~3s locally with nothing else
competing for CPU. Give it 60s instead.

.forgejo/workflows/build.yml

@@ -49,8 +49,13 @@ jobs:
           docker run -d --name "$name" \
             -e THERMOGRAPH_FRONTEND_BASE_INTERNAL=http://127.0.0.1:1 \
             -p "127.0.0.1:${port}:8137" thermograph-backend:ci
+          # 60s, not 30 -- confirmed by a real run's own docker logs: alembic
+          # migrations + starting 4 uvicorn workers took just over 30s under
+          # this runner's resource contention (capacity 2, so another job's
+          # build often runs concurrently), even though the same boot takes
+          # ~3s locally with nothing else competing for CPU.
           ok=0
-          for i in $(seq 1 30); do
+          for i in $(seq 1 60); do
             if curl -fsS -o /dev/null "http://127.0.0.1:${port}/healthz"; then ok=1; break; fi
             sleep 1
           done