Add basic CI

.github/workflows/ci.yml

@@ -0,0 +1,54 @@
+name: CI checks
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: Build on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build binary
+        run: cargo build
+      - name: Verify working directory is clean
+        run: git diff --exit-code
+
+  build-latest:
+    name: Build latest on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    continue-on-error: true
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+    steps:
+      - uses: actions/checkout@v4
+      - name: Remove lockfile to build with latest dependencies
+        run: rm Cargo.lock
+      - name: Build binary
+        run: cargo build
+      - name: Verify working directory is clean (excluding lockfile)
+        run: git diff --exit-code ':!Cargo.lock'
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run Clippy
+        uses: auguwu/clippy-action@1.3.0
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          working-directory: ${{ inputs.target }}
+          deny: warnings
+
+  fmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check formatting
+        run: cargo fmt --all -- --check