From 2971282d08bfefa015d3c6e23d19d29bce015320 Mon Sep 17 00:00:00 2001
From: MathisWellmann <wellmannmathis@gmail.com>
Date: Fri, 23 Jan 2026 14:21:18 +0000
Subject: [PATCH 1/2] CI: introduce first CI workflow

---
 .github/workflows/ci.yml | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 .github/workflows/ci.yml

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..0726bfb
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,25 @@
+name: "Rust checks"
+
+on:
+  pull_request:
+    branches: [ main ]
+
+permissions:
+  contents: read
+  actions: read
+
+jobs:
+  check:
+    # Target self-hosted runner by label
+    runs-on: [ nixos ]
+
+    # SECURITY: Require manual approval for external PRs
+    if: ${{ github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository }}
+
+    steps:
+      - name: checkout-code
+        uses: actions/checkout@v4
+
+      - name: cargo-check
+        run: nix develop --command cargo check
+

From 9901cdc7999130c8e72f216cffa6b3ef31186635 Mon Sep 17 00:00:00 2001
From: MathisWellmann <wellmannmathis@gmail.com>
Date: Thu, 5 Feb 2026 12:09:40 +0000
Subject: [PATCH 2/2] CI: add a bunch more steps

---
 .github/workflows/ci.yml | 39 +++++++++++++++++++++++++++++++++++++++
 flake.nix                |  6 ++++--
 2 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0726bfb..6fa6725 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,5 +21,44 @@ jobs:
         uses: actions/checkout@v4
 
       - name: cargo-check
+        env:
+          RUSTFLAGS: "-D warnings" # Make all warnings deny.
         run: nix develop --command cargo check
 
+      - name: cargo-test
+        env:
+          RUSTFLAGS: "-D warnings" # Make all warnings deny.
+        run: nix develop --command cargo test
+
+      # TODO: make clippy work
+      # - name: cargo-clippy
+      #   env:
+      #     RUSTFLAGS: "-D warnings" # Make all warnings deny.
+      #   run: nix develop --command cargo clippy
+
+      - name: cargo-bench
+        run: nix develop --command cargo bench --no-run # Just to make sure it compiles
+
+      - name: cargo-fmt
+        run: nix develop --command cargo fmt --check
+
+      - name: cargo-doc
+        run: nix develop --command cargo doc
+
+      - name: nix-flake-check
+        run: nix flake check
+
+      - name: nix-deadnix
+        run: nix develop --command deadnix
+
+      - name: nix-statix
+        run: nix develop --command statix check
+
+      - name: nix-alejandra
+        run: nix develop --command alejandra --check .
+
+      # TODO: enable hongdown
+      # - name: markdown-formatting
+      #   run: nix develop --command hongdown --check .
+      
+
diff --git a/flake.nix b/flake.nix
index 638b299..cdf759a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -55,7 +55,6 @@
         with pkgs; {
           devShells.default = mkShell {
             buildInputs = [
-              (lib.hiPrio rust-bin.nightly."2025-02-01".rustfmt)
               rust
               cargo-nextest
               cargo-semver-checks
@@ -64,7 +63,10 @@
               cargo-tarpaulin # Code coverage
               cargo-audit
               cargo-machete
-              taplo
+              taplo # Format `.toml` files.
+              deadnix # Nix dead code checker
+              alejandra # Nix code formatter.
+              statix # Nix static code checker.
               mprocs # Run multiple commands in parallel from `mprocs.yml`, acting essentially as a local CI system.
               hongdown.packages.${system}.hongdown
               creusot # Execute with `cargo creusot`