Run linting, formatting, and tests in CI using Nix

.github/workflows/ci.yml

@@ -1,69 +1,25 @@
 # Based on https://github.com/actions-rs/meta/blob/master/recipes/quickstart.md
 #
-# While our "example" application has the platform-specific code,
-# for simplicity we are compiling and testing everything on the Ubuntu environment only.
-# For multi-OS testing see the `cross.yml` workflow.
+# While our "example" application has platform-specific code,
+# for simplicity we are compiling and testing everything in a nix-on-Linux environment only.
 
 on: [push, pull_request]
 
 name: ci
 
 jobs:
-  check:
-    name: Check
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout sources
-        uses: actions/checkout@v2
-
-      - name: Install stable toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-
-      - name: Run cargo check
-        uses: actions-rs/cargo@v1
-        with:
-          command: check
-
-  test:
-    name: Test Suite
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout sources
-        uses: actions/checkout@v2
-
-      - name: Install nix
-        uses: cachix/install-nix-action@v18
-
-      - name: Run tests
-        run: nix develop --command cargo test
-
-  lints:
+  nix-flake-check:
     name: Lints
     runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
-      - name: Install stable toolchain
-        uses: actions-rs/toolchain@v1
-        with:
-          profile: minimal
-          toolchain: stable
-          override: true
-          components: rustfmt, clippy
+      - name: Install nix
+        uses: cachix/install-nix-action@v21
 
-      - name: Run cargo fmt
-        uses: actions-rs/cargo@v1
-        with:
-          command: fmt
-          args: --all -- --check
+      - name: Ensure the build succeeds
+        run: nix build
 
-      - name: Run cargo clippy
-        uses: actions-rs/cargo@v1
-        with:
-          command: clippy
-          args: -- -D warnings
+      - name: Run `nix flake check` to run formatters, linters, and tests
+        run: nix flake check --print-build-logs