feat: push build deps to cachix

README.md

@@ -275,6 +275,7 @@ Thank you ❤️
 - [Joachim Ernst](https://github.com/0x4A6F).
 - [David Arnold](https://github.com/blaggacao).
 - [David Hauer](https://github.com/DavHau).
+- [Ryan Mulligan](https://github.com/ryantm).
 - [Fabian Möller](https://github.com/B4dM4n).
 - [Rok Garbas](https://github.com/garbas).
 - [Yorick van Pelt](https://github.com/yorickvP).

buildkite.yaml

@@ -8,7 +8,12 @@ steps:
     command:
       - echo +++
       - nix build .#alejandra-binaries
-      - cachix push alejandra result
+      - nix-store
+        --query
+        --include-outputs $(nix-store --query --deriver result)
+        --requisites |
+        grep -v '\.drv$$' |
+        cachix push alejandra
       - cp -L result/* .
 
   - label: coverage