Add CI

.github/workflows/ci.yaml

@@ -0,0 +1,28 @@
+name: CI
+on:
+  push:
+    branches: [main, "alpha/**"]
+  pull_request:
+    branches: [main, "alpha/**"]
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        toolchain: ["nightly", "stable"]
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ matrix.toolchain }}
+          components: rustfmt, clippy
+      - name: Format
+        run: cargo fmt --check
+      - name: Set feat_toolchain
+        run: echo "feat_toolchain=$(if [[ '${{ matrix.toolchain }}' = 'stable' ]]; then printf 'stable'; fi)" >> "$GITHUB_ENV"
+      - name: Lint
+        run: cargo clippy --no-deps --no-default-features -F "$feat_toolchain" -- -Dwarnings
+      - name: Test
+        run: cargo test --no-default-features -F "$feat_toolchain"