Create haskell toolchain OCI image

Summary

Create OCI image with Haskell toolchain for omnirepo workflows.

Contents

• Everything from git image
• ghc
• cabal
• bild (repo's build tool)

Challenges

This image will be large. Consider:

• Use GHC from nixpkgs (not full haskell.nix)
• Only include runtime deps, not full dev environment
• May need to build bild statically and include just the binary

Implementation

# Omni/Agentd/Images/Haskell.nix
{ pkgs, agent-git, bild }:

pkgs.dockerTools.buildLayeredImage {
  name = "agent-haskell";
  tag = "latest";
  fromImage = agent-git;
  
  contents = [
    pkgs.ghc
    pkgs.cabal-install
    bild
  ];
}

Alternative: Just bild

If full GHC is too heavy, could include just:

• bild binary (statically linked)
• Pre-built common dependencies

The agent would use bild for compilation, not raw ghc.

Deliverables

• [ ] Omni/Agentd/Images/Haskell.nix
• [ ] Image builds (may take a while)
• [ ] podman run agent-haskell bild --help works
• [ ] Document image size