Nix loadtests and memory tests fail when adding GHC.DataSize

[steve-chavez]

Yeah, running the loadtest in CI is not working when dependencies are changed, because it needs to run against the base branch, which doesn't have the dependencies, yet... and then cabal just breaks it somehow.

You can run something like this locally to get the same markdown output:

          postgrest-loadtest-against main v12.2.5
          postgrest-loadtest-report

(but it's likely that it fails the same way... :D)

Originally posted in #3802 (comment)

[wolfgangwalther]

As mentioned in #3802 (comment), this was fixed a while ago.

The issue that is open from that PR is different:

#3802 (comment)

[nix-shell]$ postgrest-loadtest
...
src/PostgREST/Auth.hs:44:1: error:
    Could not find module ‘GHC.DataSize’
    Perhaps you haven't installed the profiling libraries for package ‘ghc-datasize-0.2.7’?
    Use -v (or `:set -v` in ghci) to see a list of the files searched for.
   |
44 | import GHC.DataSize            (recursiveSizeNF)
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

This same error appears for the memory test and the dynamically linked nix builds. This is not specific to the loadtest.