Add CI that runs tests

.github/workflows/tests.yml

@@ -0,0 +1,33 @@
+name: tests
+
+on:
+  push:
+    branches:
+      - '**'
+  pull_request:
+    branches:
+      - '**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Install Rust
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: stable
+        profile: minimal
+        override: true
+
+    - name: Run tests
+      run: cargo test
+
+    - name: Run clippy
+      run: cargo clippy --all-targets --all-features -- -D warnings
+
+    - name: Format code
+      run: cargo fmt -- --check