added postgresl ibrary dependency

Dockerfile.backend

@@ -1,6 +1,7 @@
 FROM python:3.11-slim
 ARG API_URL
 WORKDIR /app
+RUN apt-get update && apt-get --no-install-recommends -y install libpq5 && rm -rf /var/apt/cache/*
 RUN adduser --disabled-password --home /app reflex
 COPY --chown=reflex --from=gitea.pb42.de/matthias/reflex-ipad:builder /app /app
 COPY --chown=reflex deploy/* .

requirements.txt

@@ -1,2 +1,3 @@
 reflex==0.3.7
 croniter==2.0.1
+psycopg2