chore(compose.yml): update Docker Compose for production deployment

Add postgres service with environment variable for password.
Change app image to registry and adjust ports.
Update volume mount to production path.
Add deploy constraints for manager nodes.

compose.yml

@@ -1,10 +1,26 @@
 services:
   app:
-    container_name: deno_fresh_app
-    build: .
+    image: registry.docker.polytech.djalim.fr/polympr:latest
     ports:
-      - "80:80"
-      - "443:443"
+      - "8008:80"
+      - "4430:443"
     volumes:
-      - .:/app
+      - /home/kevin/PolyMPR/:/app
     command: deno run -A main.ts
+    deploy:
+      replicas: 1
+      placement:
+        constraints: [node.role == manager]
+
+  db:
+    image: postgres
+    restart: always
+    shm_size: 128mb
+    environment: 
+      POSTGRES_PASSWORD: ${POSTGRES_PASS}
+    deploy:
+      replicas: 1
+      placement:
+        constraints: [node.role == manager]
+
+