chore(nix): Move files around to conform to new read-tree layout

Broadly speaking, the following things are included:

* there is now a uniform `args` struct that is passed to all
  derivations, package headers have been changed appropriately
* overrides are now loaded from a separate `override` folder just
  using read-tree.nix
* third-party packages have moved into the `third_party` attribute set

1 files changed, 8 insertions, 0 deletions

diff --git a/third_party/ormolu.nix b/third_party/ormolu.nix
new file mode 100644
index 000000000000..3175e25ff138
--- /dev/null
+++ b/third_party/ormolu.nix
@@ -0,0 +1,8 @@
+{ pkgs, ... }:
+
+import (pkgs.fetchFromGitHub {
+  owner = "tweag";
+  repo = "ormolu";
+  rev = "a7076c0f83e5c06ea9067b71171859fa2ba8afd9";
+  sha256 = "1p4n2ja4ciw3qfskn65ggpy37mvgf2sslxqmqn8s8jjarnqcyfny";
+}) { inherit pkgs; }