Use nix CI

.github/workflows/rust.yml

@@ -1,25 +1,33 @@
-name: Rust
-
+# inspired by https://github.com/danth/stylix/blob/master/.github/workflows/docs.yml
+name: Rust-build
 on:
   push:
-    branches: [ "main" ]
+    branches: ["main"]
   pull_request:
-    branches: [ "main" ]
-
-env:
-  CARGO_TERM_COLOR: always
-
+    branches: ["main"]
 jobs:
   build:
-    runs-on: [self-hosted, ubuntu]
+    name: Build
+    permissions:
+      contents: read
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - name: nightly-rust
-        uses: actions-rs/toolchain@v1
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@main
         with:
-          profile: minimal
-          toolchain: nightly
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          extra-conf: |
+            extra-experimental-features = nix-command flakes
+      - name: Set up cache
+        uses: DeterminateSystems/magic-nix-cache-action@main
+      - name: action
+        uses: cachix/install-nix-action@v25
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+      - name: cache
+        uses: cachix/cachix-action@v14
+        with:
+          name: reset
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
       - name: Build
-        run: cargo build --verbose
-      - name: Run clippy
-        run: cargo clippy --fix
+        run: nix -L build github:${{ github.repository }}/${{ github.sha }} --no-write-lock-file