docker-composeを使ってmysql8のコンテナが立ち上がらない

docker-compose.ymlでmysql:latestのイメージを使ってコンテナを立ち上げようとしたところ、すぐにEXITしてしまいます。

$ docker container logs [mysqlのコンテナID]

を使ってログを調べたところ、以下のようなエラーメッセージが出ました。

Initializing database
2019-06-07T05:00:20.272144Z 0 [Warning] [MY-011070] [Server] 'Disabling symbolic links using --skip-symbolic-links (or equivalent) is the default. Consider not using this option as it' is deprecated and will be removed in a future release.
2019-06-07T05:00:20.272284Z 0 [System] [MY-013169] [Server] /usr/sbin/mysqld (mysqld 8.0.16) initializing of server in progress as process 28
2019-06-07T05:00:26.261672Z 5 [Warning] [MY-010453] [Server] root@localhost is created with an empty password ! Please consider switching off the --initialize-insecure option.
2019-06-07T05:00:31.340903Z 0 [System] [MY-013170] [Server] /usr/sbin/mysqld (mysqld 8.0.16) initializing of server has completed
Database initialized
MySQL init process in progress...
MySQL init process in progress...
MySQL init process in progress...
2019-06-07T05:00:33.837031Z 0 [Warning] [MY-011070] [Server] 'Disabling symbolic links using --skip-symbolic-links (or equivalent) is the default. Consider not using this option as it' is deprecated and will be removed in a future release.
2019-06-07T05:00:33.837240Z 0 [System] [MY-010116] [Server] /usr/sbin/mysqld (mysqld 8.0.16) starting as process 79
2019-06-07T05:00:35.894104Z 0 [Warning] [MY-010068] [Server] CA certificate ca.pem is self signed.
2019-06-07T05:00:35.897997Z 0 [Warning] [MY-011810] [Server] Insecure configuration for --pid-file: Location '/var/run/mysqld' in the path is accessible to all OS users. Consider choosing a different directory.
2019-06-07T05:00:36.041503Z 0 [System] [MY-010931] [Server] /usr/sbin/mysqld: ready for connections. Version: '8.0.16'  socket: '/var/run/mysqld/mysqld.sock'  port: 0  MySQL Community Server - GPL.
2019-06-07T05:00:36.096803Z 0 [System] [MY-011323] [Server] X Plugin ready for connections. Socket: '/var/run/mysqld/mysqlx.sock'
Warning: Unable to load '/usr/share/zoneinfo/iso3166.tab' as time zone. Skipping it.
Warning: Unable to load '/usr/share/zoneinfo/leap-seconds.list' as time zone. Skipping it.
Warning: Unable to load '/usr/share/zoneinfo/zone.tab' as time zone. Skipping it.
Warning: Unable to load '/usr/share/zoneinfo/zone1970.tab' as time zone. Skipping it.
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 1396 (HY000) at line 1: Operation CREATE USER failed for 'root'@'%'

このエラーメッセージについて調べてみたのですが、一体何が原因で、どこをどう直せば解消されるのか、よくわかりませんでした。
教えていただけると幸いです。

以下がdocker-compose.ymlのソースコードになります。

yml
1version: '2'
2services:
3  rails: &app_base
4    build:
5      context: .
6      dockerfile: "Dockerfile.dev"
7    command: ["bundle", "exec", "rails", "s", "-p", "3000", "-b", "0.0.0.0"]
8    env_file:
9      - "./.env.dev"
10    environment:
11      - "WEBPACKER_DEV_SERVER_HOST=webpack"
12    volumes:
13      - ".:/app"
14    volumes_from:
15      - data
16    ports:
17      - "3000:3000"
18    depends_on:
19      - db
20    tty: true
21    stdin_open: true
22  webpack:
23    <<: *app_base
24    command: "bin/webpack-dev-server"
25    environment:
26      - "WEBPACKER_DEV_SERVER_HOST=0.0.0.0"
27    ports:
28      - "3035:3035"
29    depends_on:
30      - rails
31    tty: false
32    stdin_open: false
33  db:
34    image: "mysql"
35    command: "--default-authentication-plugin=mysql_native_password"
36    environment:
37      - "MYSQL_USER=root"
38      - "MYSQL_PASSWORD=rootroot"
39      - "MYSQL_ROOT_PASSWORD=rootroot"
40    volumes_from:
41      - data
42    ports:
43      - "3316:3306"
44  data:
45    image: "busybox"
46    volumes:
47      - "db:/var/lib/mysql/data"
48      - "bundle:/usr/local/bundle"
49
50volumes:
51  db:
52    driver: local
53  bundle:
54    driver: local