Refactor Dockerfile to separate build and runtime stages for FreeRADIUS with PostgreSQL

Dockerfile

@@ -1,6 +1,9 @@
-FROM freeradius/freeradius-server:latest
+###############################################
+# Stage 1 — Build FreeRADIUS with PostgreSQL
+###############################################
+FROM debian:stable AS builder
 
-# Build dependencies
+# Install build dependencies
 RUN apt-get update && \
     apt-get install -y \
     git \
@@ -9,19 +12,31 @@ RUN apt-get update && \
     pkg-config \
     autoconf \
     automake \
-    libtool && \
+    libtool \
+    libssl-dev && \
     rm -rf /var/lib/apt/lists/*
 
-# Build PostgreSQL module
-RUN cd /tmp && \
-    git clone --depth 1 https://github.com/FreeRADIUS/freeradius-server.git && \
-    cd freeradius-server && \
-    ./configure --with-rlm-sql-postgresql && \
+# Build FreeRADIUS from source
+WORKDIR /build
+RUN git clone --depth 1 https://github.com/FreeRADIUS/freeradius-server.git
+
+WORKDIR /build/freeradius-server
+
+RUN ./configure --with-rlm-sql-postgresql && \
     make && \
     make install
 
-# Runtime: point FreeRADIUS to the compiled module directory
-RUN ln -s /usr/local/lib/freeradius /usr/lib/freeradius
 
-# Runtime: use the compiled config directory
-RUN rm -rf /etc/freeradius && ln -s /usr/local/etc/raddb /etc/freeradius
+###############################################
+# Stage 2 — Runtime image
+###############################################
+FROM freeradius/freeradius-server:latest
+
+# Copy compiled modules and configs from builder
+COPY --from=builder /usr/local/lib/freeradius /usr/lib/freeradius
+COPY --from=builder /usr/local/etc/raddb /etc/freeradius
+
+# Optional: ensure SQL module is enabled
+RUN ln -s /etc/freeradius/mods-available/sql /etc/freeradius/mods-enabled/sql
+
+# FreeRADIUS runs automatically via base image entrypoint