chore: init docker compose for caddy, postgres, watchtower

docker/postgres/.env.example

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

docker/postgres/compose.yaml

@@ -0,0 +1,23 @@
+services:
+  postgres:
+    image: postgres:18
+    restart: unless-stopped
+    ports:
+      - 5432:5432
+    volumes:
+      - ./volumes/data:/var/lib/postgresql
+    environment:
+      TZ: Asia/Shanghai
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+    healthcheck:
+      test:
+        - CMD-SHELL
+        - pg_isready -U postgres
+      interval: 1s
+      timeout: 5s
+      retries: 10
+
+networks:
+  default:
+    name: db