Update mysql
Update mysql

Changes:

- https://github.com/docker-library/mysql/commit/bc6e37a: Merge pull request https://github.com/docker-library/mysql/pull/500 from Istador/escape_database_wildcard
- https://github.com/docker-library/mysql/commit/7a87af0: Escape database underscore wildcard
- https://github.com/docker-library/mysql/commit/a769034: Merge pull request https://github.com/docker-library/mysql/pull/667 from docker-library/github-actions
- https://github.com/docker-library/mysql/commit/ab66888: Add initial GitHub Actions CI

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