build(repo): structure the repo into postgresql subdirectory with separate template and internal tests

postgresql/tests/docker/docker-compose.yml

@@ -0,0 +1,20 @@
+services:
+  postgres:
+    image: postgres:${PG_VERSION}
+    container_name: zabbix-db-test
+    environment:
+      POSTGRES_PASSWORD: zabbix
+      POSTGRES_USER: zabbix
+      POSTGRES_DB: zabbix
+      PGDATA: /var/lib/postgresql/data/pgdata
+    ports:
+      - "5432:5432"
+    volumes:
+      - ./init_scripts:/docker-entrypoint-initdb.d
+    tmpfs:
+      - /var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U zabbix"]
+      interval: 5s
+      timeout: 5s
+      retries: 5