refactor: update build process to create a single all-in-one Docker image and adjust related configurations

docker-compose.prod.yml

@@ -1,33 +1,10 @@
 services:
-
-  # ── PostgreSQL ───────────────────────────────────────────────────────────────
-  postgres:
-    image: postgres:16-alpine
-    restart: always
-    environment:
-      POSTGRES_DB: condado
-      POSTGRES_USER: ${SPRING_DATASOURCE_USERNAME}
-      POSTGRES_PASSWORD: ${SPRING_DATASOURCE_PASSWORD}
-    volumes:
-      - postgres-data:/var/lib/postgresql/data
-    networks:
-      - condado-net
-    healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U ${SPRING_DATASOURCE_USERNAME} -d condado"]
-      interval: 10s
-      timeout: 5s
-      retries: 5
-
-  # ── Backend (Spring Boot) ────────────────────────────────────────────────────
-  backend:
-    image: condado-newsletter-backend:latest
-    restart: always
-    depends_on:
-      postgres:
-        condition: service_healthy
+  condado-newsletter:
+    image: condado-newsletter:latest
+    container_name: condado-newsletter
+    restart: unless-stopped
     environment:
       SPRING_PROFILES_ACTIVE: prod
-      SPRING_DATASOURCE_URL: ${SPRING_DATASOURCE_URL}
       SPRING_DATASOURCE_USERNAME: ${SPRING_DATASOURCE_USERNAME}
       SPRING_DATASOURCE_PASSWORD: ${SPRING_DATASOURCE_PASSWORD}
       APP_PASSWORD: ${APP_PASSWORD}
@@ -48,23 +25,22 @@ services:
     extra_hosts:
       - "celtinha.desktop:host-gateway"
       - "host.docker.internal:host-gateway"
-    networks:
-      - condado-net
-
-  # ── Frontend + Nginx ─────────────────────────────────────────────────────────
-  nginx:
-    image: condado-newsletter-frontend:latest
-    restart: always
-    ports:
-      - "80:80"
-    depends_on:
-      - backend
-    networks:
-      - condado-net
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.condado.rule=Host(`condado-newsletter.lab`)"
+      - "traefik.http.services.condado.loadbalancer.server.port=80"
+      - "homepage.group=Hyperlink"
+      - "homepage.name=Condado Newsletter"
+      - "homepage.description=Automated newsletter generator using AI"
+      - "homepage.logo=https://raw.githubusercontent.com/celtinha/condado-newsletter/main/docs/logo.png"
+      - "homepage.url=http://condado-newsletter.lab"
 
 volumes:
   postgres-data:
 
 networks:
-  condado-net:
-    driver: bridge
+  default:
+    name: traefik
+    external: true