Rename Datatabase env vars and add main postgres container

postgres/.env.example

@@ -0,0 +1,2 @@
+POSTGRES_USER=
+POSTGRES_PASSWORD=

postgres/docker-compose.yml

@@ -0,0 +1,18 @@
+services:
+  postgres:
+    image: ghcr.io/immich-app/postgres:17-vectorchord0.4.3-pgvectors0.3.0
+    container_name: database
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+      POSTGRES_INITDB_ARGS: '--data-checksums --encoding=UTF-8  --locale=C'
+      DB_STORAGE_TYPE: 'HDD'
+    restart: always
+    env_file:
+      - .env
+    ports:
+      - 5432:5432
+    networks:
+      - postgres
+networks:
+  postgres: