add source code and readme

build/postgresql-postgis/Dockerfile

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+# CloudNativePG-compatible PostGIS image
+# Uses imresamu/postgis as base which has ARM64 support
+FROM imresamu/postgis:16-3.4
+
+# Get additional tools from CloudNativePG image  
+FROM ghcr.io/cloudnative-pg/postgresql:16.6 as cnpg-tools
+
+# Final stage: PostGIS with CloudNativePG tools
+FROM imresamu/postgis:16-3.4
+
+USER root
+
+# Fix user ID compatibility with CloudNativePG (user ID 26)
+# CloudNativePG expects postgres user to have ID 26, but imresamu/postgis uses 999
+# The tape group (ID 26) already exists, so we'll change postgres user to use it
+RUN usermod -u 26 -g 26 postgres && \
+    delgroup postgres && \
+    chown -R postgres:tape /var/lib/postgresql && \
+    chown -R postgres:tape /var/run/postgresql
+
+# Copy barman and other tools from CloudNativePG image
+COPY --from=cnpg-tools /usr/local/bin/barman* /usr/local/bin/
+
+# Install any additional packages that CloudNativePG might need
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        curl \
+        jq \
+    && rm -rf /var/lib/apt/lists/*
+
+# Switch back to postgres user (now with correct ID 26)
+USER postgres
+
+# Keep the standard PostgreSQL entrypoint
+# CloudNativePG operator will manage the container lifecycle

build/postgresql-postgis/build.sh

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+#!/bin/bash
+set -e
+
+# Build script for ARM64 PostGIS image compatible with CloudNativePG
+
+REGISTRY="<YOUR_REGISTRY_URL>/library"
+IMAGE_NAME="cnpg-postgis"
+TAG="16.6-3.4-v2"
+FULL_IMAGE="${REGISTRY}/${IMAGE_NAME}:${TAG}"
+LOCAL_IMAGE="${IMAGE_NAME}:${TAG}"
+
+echo "Building ARM64 PostGIS image: ${FULL_IMAGE}"
+
+# Build the image
+docker build \
+    --platform linux/arm64 \
+    -t "${FULL_IMAGE}" \
+    .
+
+echo "Image built successfully: ${FULL_IMAGE}"
+
+# Test the image by running a container and checking PostGIS availability
+echo "Testing PostGIS installation..."
+docker run --rm --platform linux/arm64 "${FULL_IMAGE}" \
+    postgres --version
+
+echo "Tagging image for local testing..."
+docker tag "${FULL_IMAGE}" "${LOCAL_IMAGE}"
+
+echo "Image built and tagged as:"
+echo "  Harbor registry: ${FULL_IMAGE}"
+echo "  Local testing: ${LOCAL_IMAGE}"
+
+echo ""
+echo "To push to Harbor registry (when ready for deployment):"
+echo "  docker push ${FULL_IMAGE}"
+
+echo ""
+echo "Build completed successfully!"
+echo "Local testing image: ${LOCAL_IMAGE}"
+echo "Harbor registry image: ${FULL_IMAGE}"