update with latest build versions, includes custom build for postgres and migrating from v16 to v18

build/bookwyrm/bookwyrm-base/Dockerfile

@@ -5,6 +5,11 @@
 # Build stage - Install dependencies and prepare optimized source
 FROM python:3.11-slim AS builder
 
+LABEL org.opencontainers.image.title="BookWyrm Base" \
+      org.opencontainers.image.description="Shared base image for BookWyrm social reading platform" \
+      org.opencontainers.image.source="https://github.com/bookwyrm-social/bookwyrm" \
+      org.opencontainers.image.vendor="Keyboard Vagabond"
+
 # Install build dependencies in a single layer
 RUN apt-get update && apt-get install -y --no-install-recommends \
     git \
@@ -32,11 +37,11 @@ RUN python3 -m venv /opt/venv \
 
 # Remove unnecessary files from source to reduce image size
 # Note: .dockerignore will exclude __pycache__, *.pyc, etc. automatically
+# Note: Keep /app/locale for i18n support (translations)
 RUN rm -rf \
     /app/.github \
     /app/docker \
     /app/nginx \
-    /app/locale \
     /app/bw-dev \
     /app/bookwyrm/tests \
     /app/bookwyrm/test* \
@@ -60,9 +65,9 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     libpq5 \
     curl \
     gettext \
-    && rm -rf /var/lib/apt/lists/* \
+    && apt-get autoremove -y \
     && apt-get clean \
-    && apt-get autoremove -y
+    && rm -rf /var/lib/apt/lists/*
 
 # Create bookwyrm user for security
 RUN useradd --create-home --shell /bin/bash --uid 1000 bookwyrm