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Hamish Mackenzie 2576a948b5 Improve support for external Hackage repositories (#1370 )

* Improve support for external Hackage repositories

This change builds #535. `repository` blocks in `cabal.project` parsed and `cabal` is used to automatically downloaded them.  Then `hackage-to-nix` is used to produce the nix required.

To make it work with restricted eval (on hydra for instance) we need to include a sha256 like this:

```
repository ghcjs-overlay
  url: https://input-output-hk.github.io/hackage-overlay-ghcjs
  secure: True
  root-keys:
  key-threshold: 0
  --sha256: sha256-EPlLYPmIGtxeahlOspRzwJv+60N5mqrNC2BY4jZKceE=
```

To find the correct `sha256` put in an invalid one and attempt a build.

2022-02-18 00:42:11 +13:00

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 packages: *.cabal
 -- Including `repository` here now actually causes haskell.nix to try
 -- to download the repository.  Luckily this test still works with this
 -- commented out.
 -- See the ghcjs-overlays test for an example of how to use `repository` blocks.
 -- repository local
 --    url: http://127.0.0.1:7777