build: setup Docker dev configuration

- Add `.dockerignore` file
- Add `Dockerfile.dev`
- Modify `docker-compose.yml`:
  - Add `restart: on-failure` to `app` service
  - Modify `build` section of `app` service
  - Remove `links` section from `app` service
  - Add `networks` section to `app` and `db` services
  - Add `networks` section to the end of the file

Signed-off-by: wancat <wancat@wancat.cc>

docker-compose.yml

@@ -2,19 +2,32 @@ version: '3'
 services:
   app:
     image: lancatlin/linux-odyssey
-    build: .
+    restart: on-failure
+    build:
+      context: .
+      dockerfile: Dockerfile.dev
+    networks:
+      - internal
+      - players
     ports:
       - '3000:3000'
-    links:
-      - db
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
+      - ./server:/app/server
     environment:
       - MONGO_URL=mongodb://db:27017/odyssey-test
+      - DOCKER_NETWORK=linux-odyssey-players
   db:
     image: mongo
     restart: always
+    networks:
+      - internal
     ports:
       - '27017:27017'
     volumes:
       - ./data:/data/db
+
+networks:
+  internal:
+  players:
+    name: linux-odyssey-players