Add CI, nix, incorporate GHC updates #23
                
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In lieu of the dap updates #22 , and ghc-whole-program-compiler project updates (to GHC-9.6.6+), we should now be able to test the haskell-debugger with our new dap changes. This is the second PR in a set to upgrade and abstract some facilities for preparing a dap release.
dap-estgi-server)souffle-4.0This PR includes the updates seen in grin-compiler/ghc-whole-program-compiler-project#13 to prepare for #22. I have moved my fork of
ghc-whole-program-compilerto this github org (@haskell-debugger) and this PR now uses that fork.We should now be able to build (and soon test) #22 in CI on this repo by altering
source.jsonandcabal.projectto point to the fork made by @alt-romes and @mpickering.cc @csabahruska