Temp github action to replace borked hydra setup

.github/workflows/build.yml

@@ -0,0 +1,45 @@
+# TODO Remove when I can be arsed to fix the hydra server
+name: "Build"
+on: { push: { branches: [ "main" ] } }
+jobs:
+  nix-build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: cachix/install-nix-action@v25
+    - uses: cachix/cachix-action@v14
+      with:
+        name: npp
+        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+    - uses: nixbuild/nixbuild-action@v19
+      with:
+        nixbuild_token: ${{ secrets.NIXBUILD_NET_AUTH_TOKEN }}
+
+    # Evaluating things one by one like this is slower but also does not require ungodly amounts of memory
+    - run: |
+        set -euo pipefail
+
+        # shellcheck disable=SC2016
+        nix eval --impure .#hydraJobs --apply '
+          hydraJobs:
+          let
+            flatten = x:
+              if builtins.isList x then
+                builtins.concatMap flatten x
+              else
+                [ x ]
+            ;
+
+            recurse = set: builtins.map (x: x.path) (flatten (recurse'"'"' [ ] set));
+            recurse'"'"' = path: set:
+              if set.type or "" == "derivation" then
+                { inherit path; }
+              else
+                builtins.map (name: recurse'"'"' (path ++ [ name ]) set.${name}) (builtins.attrNames set)
+            ;
+
+          in
+          recurse hydraJobs
+        ' --json \
+        | nix run nixpkgs#jq -- --raw-output0 '.[] | map("\"" + . + "\"") | join(".")' \
+        | xargs -tr0I{} nix -L build --impure --keep-going .#hydraJobs.{} -o result-{}