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With this change, build-images.py stops building the webserver flavour, which is currently based on the buster mediawiki-httpd image.
The latter is causing problems due to the recent archival of buster from debian mirrors.
There are a couple of ways we could go at this, but this is by far the simplest (and we can reassess later on what we want the flavour name to be long-term).
Bug: T378128