Fix nix GitHub action (#253)

* Fix nix github actions

- Use `nix develop`
- Check if pre-commit hooks work.
- Use `rust-cache`
- Remove unused git config

* Remove non-existant flake input override

.github/workflows/build_nix.yml

@@ -14,34 +14,19 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 90
     steps:
-      - name: Configure Git
-        run: |
-          git config --global url."https://ancient123:${{ secrets.ORG_GITHUB_PAT }}@github.com/".insteadOf git://github.com/
-          git config --global url."https://ancient123:${{ secrets.ORG_GITHUB_PAT }}@github.com/".insteadOf ssh://[email protected]/
-
       - name: Checkout Repository
         uses: actions/checkout@v4
 
       - name: Install Nix
         uses: cachix/install-nix-action@v24
 
-      # - uses: cachix/cachix-action@v12
-      #   with:
-      #     name: espresso-systems-private
-      #     authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+      - uses: Swatinem/rust-cache@v2
 
-      - name: Cache cargo
-        uses: actions/[email protected]
-        with:
-          path: |
-            ~/.cargo-nix/registry/index
-            ~/.cargo-nix/registry/cache
-            ~/.cargo-nix/git
-            target
-          key: espresso-nix-v2-${{ hashFiles('Cargo.lock') }}
+      - name: Nix environment loads
+        run: nix develop -c echo Success
 
-      - name: "Sanity Check: nix environment loads"
-        run: nix-shell --run "echo Success"
+      - name: Nix environment builds all targets
+        run: nix develop -c cargo build --all-targets --all-features --release --workspace
 
-      - name: "Sanity Check: nix environment builds all targets"
-        run: nix-shell --run "cargo build --all-targets --all-features --release --workspace"
+      - name: Precommit hooks work
+        run: nix develop -c pre-commit run --all-files

flake.nix

@@ -23,7 +23,6 @@
   inputs.rust-overlay.url = "github:oxalica/rust-overlay";
 
   inputs.pre-commit-hooks.url = "github:cachix/pre-commit-hooks.nix";
-  inputs.pre-commit-hooks.inputs.flake-utils.follows = "flake-utils";
   inputs.pre-commit-hooks.inputs.nixpkgs.follows = "nixpkgs";
 
   outputs = { self, nixpkgs, flake-utils, rust-overlay, pre-commit-hooks, ... }: