ci: add windows and macos + formatting

.github/workflows/rust.yml

@@ -1,23 +1,27 @@
-name: Rust
+name: Rust build & tests
 
 on:
   pull_request:
   push:
     branches:
-    - "master"
+      - "master"
     tags:
-    - '*'
+      - "*"
 
 env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  build:
-    runs-on: ubuntu-latest
+  test:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
-    - uses: actions/checkout@v3
-    - name: Build
-      run: cargo build --locked --verbose
-    - name: Run tests
-      run: cargo test --locked --verbose
+      - uses: actions/checkout@v4
+      - name: Build
+        run: cargo build --locked --verbose
+      - name: Run tests
+        run: cargo test --locked --verbose