[bitnami/wordpress] Add env var to disable XML-RPC

[kimdre]

Description of the change

This PR implements a new environment variable to the (Apache) Wordpress image called WORDPRESS_ENABLE_XML_RPC, that lets you disable/block access to the Wordpress XML-RPC endpoint at xmlrpc.php, as this endpoint is deprecated in favor of the now used Wordpress Rest API and may have security vulnerabilities.
The current best-practice is to disable access to it alltogether if you don't need it, so you should have the abillity to do so in my opinion.

To disable access to the XML-RPC endpoint you can set WORDPRESS_ENABLE_XML_RPC=no.
This will create a new htaccess rule when WordPress is initialized:

# Disable the oudated WordPress XML-RPC endpoint to prevent security vulnerabilities.
<Files xmlrpc.php>
Order Allow,Deny
Deny from all
</Files>

Benefits

By blocking the XML-RPC endpoint you now have one thing less to worry about as a site administrator.
There are also some plugins that do the same, or you could use a filter in the child theme. However, for me, using the htaccess file is the best and safest approach.

Possible drawbacks

Blocking the endpoint could cause problems for users who still use it for access through third-party software.
However, the endpoint has long been deprecated, so further use is already discouraged and it will likely be removed altogether somewhere in the future.

Applicable issues

• fixes [bitnami/wordpress] Add env var to disable XML-RPC  #50755

[joancafom]

Thanks for your PR! I left you some comments as a review, could you please check them?

[kimdre]

Now both the Apache and Nginx images support this option and use the same code. This also has the advantage that the option is no longer static in the .htaccess configuration, but can now be toggled by changing the environment variable value and a container restart.

[github-actions]

This Pull Request has been automatically marked as "stale" because it has not had recent activity (for 15 days). It will be closed if no further activity occurs. Thank you for your contribution.

[kimdre]

@joancafom Could you please check the latest changes to my PR if you have time? :)

[joancafom]

Thank you so much for your contribution, the approach you followed was brilliant! I added a small comment, could you please take a look at it when you have a chance? 😁

[joancafom]

LGTM! Thanks for your changes 🚀