Move formatting check & add matrixOS

.github/workflows/rust.yml

@@ -10,16 +10,21 @@ env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  build:
-    runs-on: ubuntu-latest
+  ci:
+    name: ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
 
     steps:
       - uses: actions/checkout@v4
+      - name: Check formatting
+        run: cargo fmt --check --verbose
       - name: Build
         run: cargo build --verbose
       - name: Check linting
         run: cargo clippy -- -D warnings
       - name: Run tests
         run: cargo test --verbose
-      - name: Check formatting
-        run: cargo fmt --check --verbose
+