project: add clippy workflow

.forgejo/workflows/clippy-check.yml

@@ -0,0 +1,23 @@
+name: Code quality
+
+on: pull_request
+
+jobs:
+  check:
+    runs-on: nix-flakes
+
+    steps:
+      - name: Set up packages
+        run: |
+          echo "extra-substituters = https://builder.naxdy.org/attic" >> /etc/nix/nix.conf
+          echo "extra-trusted-public-keys = attic:05LdE8Nav5Qd1E+KOJqSwdr+WE1z8AUmSb3oKL7s8dk=" >> /etc/nix/nix.conf
+          nix profile install nixpkgs#nodejs "github:zhaofengli/attic?ref=6eabc3f02fae3683bffab483e614bebfcd476b21"
+          echo "PATH=/nix/var/nix/profiles/per-user/root/profile/bin:$PATH" >> "$GITHUB_ENV"
+      - name: Set up attic binary cache
+        run: |
+          attic login "${{ vars.BINARY_CACHE_NAME }}" "${{ vars.BINARY_CACHE_URL }}" "${{ secrets.BINARY_CACHE_AUTH_KEY }}"
+          attic use "${{ vars.BINARY_CACHE_NAME }}"
+      - uses: actions/checkout@v4
+      - name: Run Clippy
+        run: |
+          nix develop . --command cargo clippy -- -Dwarnings