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The official Docker WordPress image is minimal. It does not contain many PHP extensions even if they are required by popular WordPress plugins.
How to extend the functionality of the official WordPress image:
Please also see this article to quickly set up a WordPress test environment in a Docker container for testing plugins and themes locally before deploying them to production.
Why Is the Image Minimal?
Keeping the WordPress image minimal follows the decoupling principle. In short, this principle means that each container should handle only one concern. If additional functionality is needed, it should be managed by a separate container.