Debian/Dockerfile: update from buster to bullseye #14
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We had disabled a few Cassandane tests in cyrus-imapd because the Docker image we used to run the tests in GitHub actions was older than what we actually use to run Cyrus at Fastmail.
I'm no Docker expert, but this seemed pretty straightforward to update. I've published an image built from this to Docker hub and made a PR against cyrus-imapd to use this image.
I'll try to make a note here if it fails/succeeds.