CI: {caching,test,bench}: mk cache aware of package dep versions

[Anton-Latukha]

1. CI caches 3rd patry dependency binaries.

2. That is why we do not want to trigger on all .cabal changes. We want to
   cache only when changes in .cabal descriptions lead to changes in versions of
   deps used, or in their compilation flags. freeze files:

For example the bits of the resulting .freeze file:

active-repositories: hackage.haskell.org:merge
constraints: any.Boolean ==0.2.4,
             ...
             any.HsYAML ==0.2.1.0,
             HsYAML -exe,
             any.HsYAML-aeson ==0.2.0.1,
             HsYAML-aeson -exe,
             any.JuicyPixels ==3.3.6,
             JuicyPixels -mmap,
             any.MemoTrie ==0.6.10,
             MemoTrie -examples,
             ...
             any.QuickCheck ==2.14.2,
             QuickCheck -old-random +templatehaskell,
             aeson -bytestring-builder -cffi -developer -fast,
             ...
             any.aeson-pretty ==0.8.9,
             aeson-pretty -lib-only,
             bifunctors +semigroups +tagged,
             any.blaze-textual ==0.2.2.1,
             blaze-textual -developer -integer-simple +native,
             ...
             any.brittany ==0.13.1.2,
             brittany -brittany-dev-lib -brittany-test-perf,
             ...
             any.clock ==0.8.2,
             clock -llvm,
             any.cmdargs ==0.10.21,
             cmdargs +quotation -testprog,
             ...
             any.comonad ==5.0.8,
             comonad +containers +distributive +indexed-traversable,
             ...
             any.hashtables ==1.2.4.2,
             hashtables -bounds-checking -debug -detailed-profiling -portable -sse42 +unsafe-tricks,
             haskell-language-server -alternatenumberformat +brittany +callhierarchy +class +eval +floskell +fourmolu +haddockcomments +hlint -ignore-plugins-ghc-bounds +importlens +modulename +ormolu -pedantic +pragmas +qualifyimportednames +refineimports -rename +retrie +splice +stylishhaskell +tactic,
             ...
             any.hlint ==3.2.7,
             hlint -ghc-lib +gpl -hsyaml +threaded,
             hls-eval-plugin -pedantic,
             hls-graph -embed-files -pedantic -stm-stats,
             hls-hlint-plugin -ghc-lib -hlint33 -pedantic,
             ...
             any.integer-logarithms ==1.0.3.1,
             integer-logarithms -check-bounds +integer-gmp,
             ...
             any.lens ==5.0.1,
             lens -benchmark-uniplate -dump-splices +inlining -j +test-hunit +test-properties +test-templates +trustworthy,
             ...
             any.scientific ==0.3.7.0,
             scientific -bytestring-builder -integer-simple,
             any.semigroupoids ==5.3.6,
             semigroupoids +comonad +containers +contravariant +distributive +tagged +unordered-containers,
             any.semigroups ==0.19.2,
             semigroups +binary +bytestring -bytestring-builder +containers +deepseq +hashable +tagged +template-haskell +text +transformers +unordered-containers,
             ...
             any.transformers-compat ==0.6.6,
             transformers-compat -five +five-three -four +generic-deriving +mtl -three -two,
             ...
             any.vector ==0.12.3.1,
             vector +boundschecks -internalchecks -unsafechecks -wall,
             any.vector-algorithms ==0.8.0.4,
             vector-algorithms +bench +boundschecks -internalchecks -llvm +properties -unsafechecks,
             ...
index-state: hackage.haskell.org 2021-11-29T12:28:17Z

You got the idea. freeze collects stuff for package compilation & all dependencies.

& this file satisfies the caching for dependencies agenda.

I also checked - it solves & collects all package configurations across all
subprojects in this one file.

[Anton-Latukha]

Would note that caching .cabal - caches only 1 of (including some test samples) 53 .cabal files in monorepo (& has other implications).

[Anton-Latukha]

So.

When freeze is not possible - it essentially does what it was doing before this PR (navigates on Hackage index). But if freeze is possible - it caches what Cabal chooses.

[Anton-Latukha]

I've got another idea how to make caching even more fault tolerant. (So caching would be able to run & cache even inside #2503 environment, where dependency versions for all targets don't add up). (opened #2534).

[Anton-Latukha]

Added a workaround to GitHub CI in 0c521cc.

[jneira]

LGTM, thanks!