prepare an image to build the doc

Dockerfile

@@ -1,3 +1,23 @@
-FROM nginx:alpine
-LABEL authors="Julien Fastré"
+# -------- Stage 1: Build the documentation using mkdocs --------
+FROM python:3.13-slim AS builder
+
+WORKDIR /build
+
+# Install dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY user/ user/
+COPY admin/ admin/
+
+RUN ls
+RUN cd user && mkdocs build --clean && cd ..
+RUN cd admin && mkdocs build --clean && cd ..
+
+# -------- Stage 2: Serve the built documentation with nginx --------
+FROM nginx:alpine
+
+# Copy the built site from the builder stage
+COPY --from=builder /build/admin/site /usr/share/nginx/html/admin
+COPY --from=builder /build/user/site /usr/share/nginx/html/user