Add libzstd-dev to Debian images

IPE data compression (as implemented in ghc!9893 (closed)) requires the libzstd compression library. To enable IPE data compression tests in CI, we must have images which include libzstd. This commit ensures that the Debian images have libzstd installed.

requested review from @bgamari and @mpickering

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added 4 commits

• 27ea1b40...948b98d4 - 3 commits from branch master
• 6fc51b53 - Add libzstd-dev to Debian images

Compare with previous version

I believe I have fixed the setuptools issue. Rebased.

approved this merge request

merged

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