Remove pact as a dependency

[emmanueldenloye]

We only seemed to need it for generating the richlist. This is a lot easier than I had imagined.

[enobayram]

Oh wow, this is such a relief. This should relax our dependency resolution quite a bit while upgrading our GHC or Hackage index. Thank you for the PR!

BTW, would you mind checking how much further we can slim down the cabal.project? Now that pact is gone, I have a suspicion that the vast majority of that file's contents can be deleted.

[enobayram]

Seems like installing xz and postgresql inside the non-Nix MacOS CI fixed the build, so let's keep the non-Nix macos-latest builds for now. But since we already have the Nix builds on macos-latest (and also macos-m1), let's drop support for the non-Nix macos-latest build next time it causes issues. If somebody needs chainweb-data on macos and they don't want the nix-built version for some reason, it shouldn't be too hard for them to figure out how to set up their local environment in order to build it with cabal.

[enobayram]

I've just added index-state: 2024-02-01T00:00:00Z to the cabal.project since we're removing the cabal.project.freeze file. I'm hoping this will be a more future-proof way of maintaining consistent and stable builds inside and outside Nix.

With my latest commits, in addition to these CI builds, cabal build chainweb-data works:

• Ubuntu; Outside Nix using cabal and ghc provisioned with ghcup

• Ubuntu: Inside nix develop

• MacOS: Outside Nix using cabal and ghc provisioned with ghcup, installing xz and postgresql via homebrew and using the following cabal.project.local file:

    package *
      extra-include-dirs:
          /opt/homebrew/include
          /opt/homebrew/opt/openssl/include
      extra-lib-dirs:
          /opt/homebrew/lib
          /opt/homebrew/opt/openssl/lib
  

• MacOS: Inside nix develop.

[enobayram]

LGTM! Thanks for removing the pact dependency @emmanueldenloye, this should make chainweb-data much easier to update in the future.