Add options for secure DB connection during installation

[jeff-matthews]

Description:

PR magento/magento2#25398 introduced the following new bin/magento setup:install options in Magento 2.3.4:

• --db-ssl-key=<MYSQL_CLIENT_KEY>
• --db-ssl-cert=<MYSQL_CLIENT_CERT>
• --db-ssl-ca=<MYSQL_SERVER_CERT>

These options have not been documented in devdocs.

Possible solutions:

Add the options and descriptions to the Site, database, and RabbitMQ configuration options table in this section.

Additional information:

These options will be included in the Magento CLI Tools Reference topic when we update the data files in the devdocs project immediately following the 2.3.4 release. No further action necessary.

[keharper]

Additional notes.

The link to the "Install the Magento software" topic goes to the 2.2 version, but as far as I can tell, the new flags were added for 2.3 only. The contributor who works on this will need to

1. Break the symlink from the 2.3 version to the 2.2 version.
2. Copy the 2.2 version to the 2.3 directory.
3. Edit the copied 2.3 version.