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

build/postgresql-postgis/docker-compose.test.yaml

@@ -0,0 +1,36 @@
+# Docker Compose for local testing of PostgreSQL 18 + PostGIS image
+# 
+# Usage:
+#   docker-compose -f docker-compose.test.yaml up -d
+#   docker-compose -f docker-compose.test.yaml exec postgres psql -U postgres
+#   docker-compose -f docker-compose.test.yaml down -v
+#
+# NOTE: PostgreSQL 18 changed the data directory path!
+#   PG 13-17: /var/lib/postgresql/data
+#   PG 18+:   /var/lib/postgresql
+#
+version: '3.8'
+
+services:
+  postgres:
+    image: cnpg-postgis:18-3.6
+    platform: linux/arm64
+    container_name: postgis-test
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: testpassword
+      POSTGRES_DB: testdb
+    ports:
+      - "5432:5432"
+    volumes:
+      # NOTE: PG18 uses /var/lib/postgresql (not /var/lib/postgresql/data)
+      - postgres_data:/var/lib/postgresql
+      - ./init-extensions.sql:/docker-entrypoint-initdb.d/20-extensions.sql:ro
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+volumes:
+  postgres_data: