Uses prebuilt server image

Simplifies deployment by using a prebuilt Docker image for the server.

Removes build configuration and related port mappings from the compose file, relying on the image configuration instead.

Also adds a compose template file with the original configuration.

compose.yaml.template

@@ -0,0 +1,34 @@
+services:
+  server:
+    build:
+      context: .
+      target: final
+    environment:
+      DATABASE_URL: postgres://postgres:${DATABASE_PASSWORD}@db:5432/${DATABASE_NAME}
+    ports:
+      - 3000:3000
+    depends_on:
+      db:
+        condition: service_healthy
+
+  db:
+    image: postgres
+    restart: always
+    user: postgres
+    volumes:
+      - db-data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_DB: ${DATABASE_NAME}
+      POSTGRES_PASSWORD: ${DATABASE_PASSWORD}
+    ports:
+      - 5432:5432
+    expose:
+      - 5432
+    healthcheck:
+      test: [ "CMD", "pg_isready" ]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+volumes:
+  db-data:
+