fix: MySQL 8.2+ and mysql:8 failing to start

[AaronFeledy]

MySQL 8.2 removed expire_logs_days, but the recipe's MySQL 8 config still sets it, so mysql:8.2, 8.3 and 8.4 abort on startup with unknown variable 'expire_logs_days=10'. The bare mysql:8 alias (MySQL 8.4.5) was also loading the 5.7 config file and failing on query_cache_limit.

• Replace expire_logs_days = 10 with binlog_expire_logs_seconds = 864000: same 10 days, supported since MySQL 8.0.1
• Send mysql:8 to the MySQL 8 config
• Add examples/wordpress-mysql84 on mysql:8 to CI

Verified locally on Lando 3.26.9: lando start with database: mysql:8 boots MySQL 8.4.5 with the MySQL 8 config and binlog_expire_logs_seconds=864000.

Fixes #107

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Note

Low Risk
Targeted database config and version-routing fixes with new example/CI coverage; no auth or data-migration changes.

Overview
Fixes MySQL startup failures for the WordPress recipe on MySQL 8.2+ and the mysql:8 alias.

config/mysql8.cnf swaps the removed expire_logs_days setting for binlog_expire_logs_seconds = 864000 (equivalent 10-day retention), so 8.2+ no longer aborts on an unknown variable.

builders/wordpress.js broadens when mysql8.cnf is chosen: any version string starting with 8 (including bare mysql:8) gets the MySQL 8 config instead of the legacy 5.7 mysql.cnf that breaks on 8.4 (e.g. query_cache_limit).

CI adds examples/wordpress-mysql84 (Leia README covering mysql:8, the mysql8 config marker, and binlog_expire_logs_seconds) to the WordPress test matrix and pins run-leia-action to 1.0.0-beta.4. CHANGELOG documents both fixes.

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