docs(core): clarify developing server docs (#9420)

.docker/dev/compose.yml.example

@@ -11,7 +11,7 @@ services:
       POSTGRES_USER: ${DB_USERNAME}
       POSTGRES_DB: ${DB_DATABASE_NAME}
     volumes:
-      - ${DATABASE_LOCATION}:/var/lib/postgresql/data
+      - postgres_data:/var/lib/postgresql/data
 
   redis:
     image: redis:latest
@@ -26,3 +26,6 @@ services:
 
 networks:
   dev:
+
+volumes:
+  postgres_data:

docs/developing-server.md

@@ -7,15 +7,25 @@ This document explains how to start server (@affine/server) locally with Docker
 
 ## Run required dev services in docker compose
 
+Running yarn's server package (@affine/server) requires some dev services to be running, i.e.:
+
+- postgres
+- redis
+- mailhog
+
+You can run these services in docker compose by running the following command:
+
 ```sh
 cp ./.docker/dev/compose.yml.example ./.docker/dev/compose.yml
 cp ./.docker/dev/.env.example ./.docker/dev/.env
 
-docker compose -f ./.docker/dev/compose.yml up -d
+docker compose -f ./.docker/dev/compose.yml up
 ```
 
 ## Build native packages (you need to setup rust toolchain first)
 
+Server also requires native packages to be built, you can build them by running the following command:
+
 ```sh
 # build native
 yarn affine @affine/server-native build
@@ -51,6 +61,8 @@ when server started, it will created a default user for testing:
 yarn dev
 ```
 
+You can login with the user (dev@affine.pro / dev) above to test the server.
+
 ## Done
 
 Now you should be able to start developing affine with server enabled.