Change base images

backend/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.11-slim AS builder
+FROM docker.io/library/python:3.11-slim AS builder
 WORKDIR /build
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
@@ -9,7 +9,7 @@ COPY requirements.txt .
 RUN pip wheel --no-cache-dir --no-deps -r requirements.txt -w /build/wheels
 
 
-FROM python:3.11-slim
+FROM docker.io/library/python:3.11-slim
 WORKDIR /app
 
 # ---- Build args (desde Jenkins) ----