Use MySQL8.4 with utf8mb4

[nanasess]

This pull request includes an update to the MySQL service configuration in the docker-compose.mysql.yml file. The most important change is upgrading the MySQL version and adjusting the character set and collation settings.

MySQL service configuration update:

• docker-compose.mysql.yml: Upgraded MySQL image from mysql:8.0 to mysql:8.4 and changed the character set to utf8mb4 and collation to utf8mb4_general_ci.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.67%. Comparing base (c51b7d9) to head (e563295).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1044   +/-   ##
=======================================
  Coverage   51.67%   51.67%           
=======================================
  Files          80       80           
  Lines       10224    10224           
=======================================
  Hits         5283     5283           
  Misses       4941     4941           

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[seasoftjapan]

作成されるデータベースは utf8mb3 のようですが、意図する動作でしょうか?

$ mysql --host 127.0.0.1 --port 13306 --user eccube_db_user -p eccube_db -e 'SELECT @@character_set_database, @@collation_database;'
+--------------------------+----------------------+
| @@character_set_database | @@collation_database |
+--------------------------+----------------------+
| utf8mb3                  | utf8mb3_general_ci   |
+--------------------------+----------------------+

以下が原因と推察しています。
https://github.com/nanasess/ec-cube2/blob/ebf1770e441dec1b89fbc52a8f9cd7be85a84b66/eccube_install.sh#L270

[nanasess]

@seasoftjapan
すみません、こちらは意図しておりませんでした。 eccube_install.sh の方も修正入れますね