Drop official support / updates for debian 9 about docker-haskell HOT 5 CLOSED

Supporting the two most recent versions of Debian is a goal of sorts, but if we are limited by upstream packages then we don't have a choice. What you propose sounds good to me, with the addition that we should call it out in the docs. Essentially 8.10.7 & 9.0.1 would be the last versions to support a -stretch variant due to cabal>=3.6.2.0 not supporting it. If we can only support Debian 10 in the short term, and add 11 later, that's the best we can do.

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due to cabal>=3.6.2.0 not supporting it
to be clear, it's no longer "supported" by Debian either, though official images folks have not tracked us down and demanded we upgrade yet

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we should call it out in the docs

Sounds good. I'll update the following. Noting that for now we only support buster / oldstable for now. We can probably also drop the note at this point.

Additionally, we support the two most versions of Debian (stable and oldstable) as variants, with the most recent being the default if not specified.

Note: haskell:8.8.3 was updated from Debian Stretch to Buster, so you will need to specify haskell:8.8.3-stretch to stick with Stretch in this particular case.

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AlistairB/docs@8163982 is the doc change I am thinking of. Look ok?

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All updated 🎉

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