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62 commits this week Jul 20, 2021 - Jul 27, 2021
fix #1173: have CI build/cache GHC 8.10.4
The idea is to keep 8.10.4 in CI while 8.10.5 is still neither in
- a (non-nightly) Stackage LTS resolver
- upstream Nixpkgs-unstable

Hopefully it isn't long before 8.10.5 is more standard and we can remove
8.10.4 from the IOHK build.

This commit also updates documentation (which seems to have fallen out
of date), with some changes and additions to hopefully make things
easier on first-time readers.
Better support for source-repository-packages, only include planned components and pick latest packages (#1166)
This change updates to the latest `nix-tools` to get the following fixes (there are 3 PRs in nix-tools, but just the one in haskell.nix to avoid having to update the materialized files multiple times):

## Better support for source repository packages

* https://github.com/input-output-hk/nix-tools/pull/107

Currently these are replaced by the `cabalProject` functions with regular `packages:` before running cabal configure.  Cabal does not treat these the same (the setting of `tests:` and `benchmarks:` in the `cabal.project` file):

* The plan found by `cabalProject` may not match the one used when running `cabal`.
* The performance of the solver may not be consistent with running `cabal`.

This change replaces `source-repository-package` with another `source-repository-package` pointing at a minimal git repo.

## Only include planned components

* https://github.com/input-output-hk/nix-tools/pull/108

Only the components in the `plan.json` are now included in the haskell.nix cabal projects.  This avoids missing dependencies attempting to build components that were not in the plan.  Should fix #993.

## Pick latest packages

* https://github.com/input-output-hk/nix-tools/pull/109

When the same package occurs more than once in a `plan.json` file (perhaps because it is needed both by the project itself and by one of the `setup` dependencies or `build-tool-dependencies` of the project) the latest version will now be the one picked by haskell.nix. This is a work around for a common issue with `cabal-doctest` when cross compiling to windows (an old version of Win32 is used even if a newer one was required by the projects `constraints`).