Improve db readiness and build args parsing

.github/workflows/python-uv-ci.yml

@@ -146,13 +146,26 @@ jobs:
                 --health-retries=5 \
                 postgres:16
               for i in {1..30}; do
-                if docker exec "$container_name" pg_isready -U postgres > /dev/null 2>&1; then
-                  break
-                fi
+                health="$(docker inspect --format '{{.State.Health.Status}}' "$container_name" 2>/dev/null || true)"
+                case "$health" in
+                  healthy)
+                    break
+                    ;;
+                  unhealthy)
+                    echo "Postgres reported unhealthy." >&2
+                    docker logs "$container_name" || true
+                    exit 1
+                    ;;
+                  "")
+                    echo "Postgres health status unavailable." >&2
+                    docker logs "$container_name" || true
+                    exit 1
+                    ;;
+                esac
                 sleep 1
               done
-              if ! docker exec "$container_name" pg_isready -U postgres > /dev/null 2>&1; then
-                echo "Postgres did not become ready in time." >&2
+              if [ "${health:-}" != "healthy" ]; then
+                echo "Postgres did not become healthy in time." >&2
                 docker logs "$container_name" || true
                 exit 1
               fi